/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
LOAD 'age';
SET search_path TO ag_catalog;
SELECT create_graph('cypher_match');
NOTICE:  graph "cypher_match" has been created
 create_graph 
--------------
 
(1 row)

SELECT * FROM cypher('cypher_match', $$CREATE (:v)$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$CREATE (:v {i: 0})$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$CREATE (:v {i: 1})$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n:v) RETURN n$$) AS (n agtype);
                                   n                                   
-----------------------------------------------------------------------
 {"id": 844424930131969, "label": "v", "properties": {}}::vertex
 {"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex
 {"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n:v) RETURN n.i$$) AS (i agtype);
 i 
---
 
 0
 1
(3 rows)

SELECT * FROM cypher('cypher_match', $$
MATCH (n:v) WHERE n.i > 0
RETURN n.i
$$) AS (i agtype);
 i 
---
 1
(1 row)

--Directed Paths
SELECT * FROM cypher('cypher_match', $$
	CREATE (:v1 {id:'initial'})-[:e1]->(:v1 {id:'middle'})-[:e1]->(:v1 {id:'end'})
$$) AS (a agtype);
 a 
---
(0 rows)

--Undirected Path Tests
SELECT * FROM cypher('cypher_match', $$
	MATCH p=(:v1)-[:e1]-(:v1)-[:e1]-(:v1) RETURN p
$$) AS (a agtype);
                                                                                                                                                                                                                                                       a                                                                                                                                                                                                                                                       
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex]::path
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH p=(a:v1)-[]-()-[]-() RETURN a
$$) AS (a agtype);
                                        a                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]-()-[]-(a:v1) RETURN a
$$) AS (a agtype);
                                        a                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]-(a:v1)-[]-() RETURN a
$$) AS (a agtype);
                                        a                                        
---------------------------------------------------------------------------------
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[b:e1]-()-[]-() RETURN b
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1)-[]->(), ()-[]->(a) RETURN a
$$) AS (a agtype);
                                        a                                        
---------------------------------------------------------------------------------
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH p=()-[e]-() RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v1)-[e]-() RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v1)-[e]-(:v1) RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH ()-[]-()-[e]-(:v1) RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a)-[]-()-[]-(:v1) RETURN a
$$) AS (a agtype);
                                        a                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
(2 rows)

-- Right Path Test
SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1)-[:e1]->(b:v1)-[:e1]->(c:v1) RETURN a, b, c
$$) AS (a agtype, b agtype, c agtype);
                                        a                                         |                                        b                                        |                                      c                                       
----------------------------------------------------------------------------------+---------------------------------------------------------------------------------+------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex | {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex | {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH p=(a:v1)-[]-()-[]->() RETURN a
$$) AS (a agtype);
                                        a                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH p=(a:v1)-[]->()-[]-() RETURN a
$$) AS (a agtype);
                                        a                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]-()-[]->(a:v1) RETURN a
$$) AS (a agtype);
                                      a                                       
------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]-(a:v1)-[]->() RETURN a
$$) AS (a agtype);
                                        a                                        
---------------------------------------------------------------------------------
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[b:e1]-()-[]->() RETURN b
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v1)-[e]->() RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH ()-[e]->(:v1) RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v1)-[e]->(:v1) RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

--Left Path Test
SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1)<-[:e1]-(b:v1)<-[:e1]-(c:v1) RETURN a, b, c
$$) AS (a agtype, b agtype, c agtype);
                                      a                                       |                                        b                                        |                                        c                                         
------------------------------------------------------------------------------+---------------------------------------------------------------------------------+----------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex | {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex | {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH p=(a:v1)<-[]-()-[]-() RETURN a
$$) AS (a agtype);
                                      a                                       
------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH p=(a:v1)-[]-()<-[]-() RETURN a
$$) AS (a agtype);
                                      a                                       
------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()<-[]-()-[]-(a:v1) RETURN a
$$) AS (a agtype);
                                        a                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()<-[]-(a:v1)-[]-() RETURN a
$$) AS (a agtype);
                                        a                                        
---------------------------------------------------------------------------------
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()<-[b:e1]-()-[]-() RETURN b
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v1)<-[e]-(:v1) RETURN e
$$) AS (a agtype);
                                                             a                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

--Divergent Path Tests
SELECT * FROM cypher('cypher_match', $$
	CREATE (:v2 {id:'initial'})<-[:e2]-(:v2 {id:'middle'})-[:e2]->(:v2 {id:'end'})
$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()<-[]-(n:v2)-[]->()
	MATCH p=()-[]->(n)
	RETURN p
$$) AS (i agtype);
 i 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()<-[]-(n:v2)-[]->()
	MATCH p=(n)-[]->()
	RETURN p
$$) AS (i agtype);
                                                                                                                                                  i                                                                                                                                                   
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
(4 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]-(n:v2)
	RETURN n
$$) AS (i agtype);
                                        i                                         
----------------------------------------------------------------------------------
 {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v2)<-[]-(:v2)-[]->(:v2)
    MATCH p=()-[]->()
    RETURN p
$$) AS (i agtype);
                                                                                                                                                  i                                                                                                                                                   
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
(8 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH ()<-[]-(:v2)-[]->()
	MATCH p=()-[]->()
    RETURN p
$$) AS (i agtype);
                                                                                                                                                  i                                                                                                                                                   
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
(8 rows)

--Convergent Path Tests
SELECT * FROM cypher('cypher_match', $$
	CREATE (:v3 {id:'initial'})-[:e3]->(:v3 {id:'middle'})<-[:e3]-(:v3 {id:'end'})
$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[b:e1]->()
	RETURN b
$$) AS (i agtype);
                                                             i                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (:v3)-[b:e3]->()
    RETURN b
$$) AS (i agtype);
                                                             i                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge
 {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]->(n:v1)<-[]-()
	MATCH p=(n)<-[]-()
	RETURN p
$$) AS (i agtype);
 i 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]->(n:v1)<-[]-()
	MATCH p=()-[]->(n)
	RETURN p
$$) AS (i agtype);
 i 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[]->(n:v1)<-[]-()
	MATCH p=(n)-[]->()
	RETURN p
$$) AS (i agtype);
 i 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH con_path=(a)-[]->()<-[]-()
	where a.id = 'initial'
	RETURN con_path
$$) AS (con_path agtype);
                                                                                                                                                                                                                                                   con_path                                                                                                                                                                                                                                                    
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex, {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge, {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex, {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge, {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH div_path=(b)<-[]-()-[]->()
	where b.id = 'initial'
	RETURN div_path
$$) AS (div_path agtype);
                                                                                                                                                                                                                                                   div_path                                                                                                                                                                                                                                                    
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[]->(:v3)<-[]-(b)
	where a.id = 'initial'
	RETURN b       
$$) AS (con_path agtype);
                                   con_path                                   
------------------------------------------------------------------------------
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
(1 row)

--Patterns
SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1), p=(a)-[]-()-[]-()
	where a.id = 'initial'
	RETURN p
$$) AS (p agtype);
                                                                                                                                                                                                                                                       p                                                                                                                                                                                                                                                       
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH con_path=(a)-[]->()<-[]-(), div_path=(b)<-[]-()-[]->()
	where a.id = 'initial'
	and b.id = 'initial'
	RETURN con_path, div_path
$$) AS (con_path agtype, div_path agtype);
                                                                                                                                                                                                                                                   con_path                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                   div_path                                                                                                                                                                                                                                                    
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex, {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge, {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex, {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge, {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex]::path | [{"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v), p=()-[]->()-[]->()
	RETURN a.i, p
$$) AS (i agtype, p agtype);
 i |                                                                                                                                                                                                                                                       p                                                                                                                                                                                                                                                       
---+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
   | [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 0 | [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 1 | [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
(3 rows)

--Multiple Match Clauses
SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1)
	where a.id = 'initial'
	MATCH p=(a)-[]-()-[]-()
	RETURN p
$$) AS (p agtype);
                                                                                                                                                                                                                                                       p                                                                                                                                                                                                                                                       
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v)
	MATCH p=()-[]->()-[]->()
	RETURN a.i, p
$$) AS (i agtype, p agtype);
 i |                                                                                                                                                                                                                                                       p                                                                                                                                                                                                                                                       
---+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
   | [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 0 | [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 1 | [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex, {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge, {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex, {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge, {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
(3 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v)
	MATCH (b:v1)-[]-(c)
	RETURN a.i, b.id, c.id
$$) AS (i agtype, b agtype, c agtype);
 i |     b     |     c     
---+-----------+-----------
   | "end"     | "middle"
 0 | "end"     | "middle"
 1 | "end"     | "middle"
   | "middle"  | "end"
 0 | "middle"  | "end"
 1 | "middle"  | "end"
   | "middle"  | "initial"
 0 | "middle"  | "initial"
 1 | "middle"  | "initial"
   | "initial" | "middle"
 0 | "initial" | "middle"
 1 | "initial" | "middle"
(12 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v)
	MATCH (:v1)-[]-(c)
	RETURN a.i, c.id
$$) AS (i agtype,  c agtype);
 i |     c     
---+-----------
   | "middle"
 0 | "middle"
 1 | "middle"
   | "end"
 0 | "end"
 1 | "end"
   | "initial"
 0 | "initial"
 1 | "initial"
   | "middle"
 0 | "middle"
 1 | "middle"
(12 rows)

--
-- Property constraints
--
SELECT * FROM cypher('cypher_match',
 $$CREATE ({string_key: "test", int_key: 1, float_key: 3.14, map_key: {key: "value"}, list_key: [1, 2, 3]}) $$)
AS (p agtype);
 p 
---
(0 rows)

SELECT * FROM cypher('cypher_match',
 $$CREATE ({lst: [1, NULL, 3.14, "string", {key: "value"}, []]}) $$)
AS (p agtype);
 p 
---
(0 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (n  {string_key: NULL}) RETURN n $$)
AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (n  {string_key: "wrong value"}) RETURN n $$)
AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (n {string_key: "test", int_key: 1, float_key: 3.14, map_key: {key: "value"}, list_key: [1, 2, 3]})
    RETURN n $$)
AS (p agtype);
                                                                                    p                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match',
 $$MATCH (n {string_key: "test"}) RETURN n $$)
AS (p agtype);
                                                                                    p                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match',
 $$MATCH (n {lst: [1, NULL, 3.14, "string", {key: "value"}, []]})  RETURN n $$)
AS (p agtype);
                                                          p                                                           
----------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match',
 $$MATCH (n {lst: [1, NULL, 3.14, "string", {key: "value"}, [], "extra value"]})  RETURN n $$)
AS (p agtype);
 p 
---
(0 rows)

--
-- Prepared Statement Property Constraint
--
PREPARE property_ps(agtype) AS SELECT * FROM cypher('cypher_match',
 $$MATCH (n $props) RETURN n $$, $1)
AS (p agtype);
EXECUTE property_ps(agtype_build_map('props',
                                     agtype_build_map('string_key', 'test')));
                                                                                    p                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
(1 row)

-- need a following RETURN clause (should fail)
SELECT * FROM cypher('cypher_match', $$MATCH (n:v)$$) AS (a agtype);
ERROR:  syntax error at end of input
LINE 1: SELECT * FROM cypher('cypher_match', $$MATCH (n:v)$$) AS (a ...
                                                          ^
--invalid variable reuse, these should fail
SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[]-()-[]-(a:v1) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a)-[]-()-[]-(a:v1) RETURN a
                             ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[]-(a:v2)-[]-(a) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a)-[]-(a:v2)-[]-(a) RETURN a
                       ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[]-(a:v1) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a)-[]-(a:v1) RETURN a
                       ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[]-(a)-[]-(a:v1) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a)-[]-(a)-[]-(a:v1) RETURN a
                              ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[]-(a)-[]-(a:invalid_label) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a)-[]-(a)-[]-(a:invalid_label) RETURN a
                              ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a) MATCH (a:v1) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a) MATCH (a:v1) RETURN a
                          ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a) MATCH (a:invalid_label) RETURN a
$$) AS (a agtype);
ERROR:  multiple labels for variable 'a' are not supported
LINE 2:  MATCH (a) MATCH (a:invalid_label) RETURN a
                          ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1)-[]-()-[a]-() RETURN a
$$) AS (a agtype);
ERROR:  variable 'a' is for a vertex
LINE 2:  MATCH (a:v1)-[]-()-[a]-() RETURN a
                            ^
-- valid variable reuse for edge labels across clauses
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0]->() MATCH ()-[r0]->() RETURN r0
$$) AS (r0 agtype);
                                                            r0                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge
 {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge
(6 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->() MATCH ()-[r0:e1]->() RETURN r0
$$) AS (r0 agtype);
                                                            r0                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e2]->() MATCH ()-[r0:e2]->() RETURN r0
$$) AS (r0 agtype);
                                                            r0                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->()-[r1]->() RETURN r0,r1
$$) AS (r0 agtype, r1 agtype);
                                                            r0                                                             |                                                            r1                                                             
---------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge | {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('cypher_match', $$
        MATCH p0=()-[:e1]->() MATCH p1=()-[:e2]->() RETURN p1
$$) AS (p1 agtype);
                                                                                                                                                  p1                                                                                                                                                  
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex, {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge, {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
(4 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->()-[r1]->() MATCH ()-[r0:e1]->()-[r1]->() RETURN r0,r1
$$) AS (r0 agtype, r1 agtype);
                                                            r0                                                             |                                                            r1                                                             
---------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge | {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[]->() MATCH ()-[r1:e2]->() RETURN r1
$$) AS (r1 agtype);
                                                            r1                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
(12 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->() MATCH ()-[r1:e2]->() RETURN r0,r1
$$) AS (r0 agtype, r1 agtype);
                                                            r0                                                             |                                                            r1                                                             
---------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge | {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge | {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge | {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge | {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge
(4 rows)

-- valid variable reuse for vertex labels across clauses
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid), (r1:invalid) return r1
$$) AS (r1 agtype);
 r1 
----
(0 rows)

SELECT * FROM cypher('cypher_match', $$
         MATCH (r1), (r1) return r1
$$) AS (r1 agtype);
                                                                                   r1                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
 {"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex
 {"id": 844424930131969, "label": "v", "properties": {}}::vertex
 {"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex
 {"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
(14 rows)

SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid), (r1) return r1
$$) AS (r1 agtype);
 r1 
----
(0 rows)

SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid), (r1), (r1), (r1:invalid) return r1
$$) AS (r1 agtype);
 r1 
----
(0 rows)

SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid)-[]->(r1)-[]->(r1:invalid)-[]->(r1) return r1
$$) AS (r1 agtype);
 r1 
----
(0 rows)

SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid)-[]->()-[]->()-[]->(r1:invalid) return r1
$$) AS (r1 agtype);
 r1 
----
(0 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->()-[r1]->() MATCH ()-[r0:e1]->()-[r0]->() RETURN r0
$$) AS (r0 agtype);
 r0 
----
(0 rows)

SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->() MATCH ()-[r0]->() RETURN r0
$$) AS (r0 agtype);
                                                            r0                                                             
---------------------------------------------------------------------------------------------------------------------------
 {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge
 {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge
(2 rows)

-- invalid variable reuse for vertex
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid)-[]->(r1)-[]->(r1)-[]->(r1:invalids) return r1
$$) AS (r1 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2: ...        MATCH (r1:invalid)-[]->(r1)-[]->(r1)-[]->(r1:invalid...
                                                             ^
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid)-[]->(r1)-[]->(r1)-[]->(r1)-[r1]->() return r1
$$) AS (r1 agtype);
ERROR:  variable 'r1' is for a vertex
LINE 2: ...    MATCH (r1:invalid)-[]->(r1)-[]->(r1)-[]->(r1)-[r1]->() r...
                                                             ^
-- invalid variable reuse for labels across clauses
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:e1), (r1:e2) return r1
$$) AS (r1 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:          MATCH (r1:e1), (r1:e2) return r1
                                 ^
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:invalid), (r1:e2) return r1
$$) AS (r1 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:          MATCH (r1:invalid), (r1:e2) return r1
                                      ^
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:e1), (r1:invalid) return r1
$$) AS (r1 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:          MATCH (r1:e1), (r1:invalid) return r1
                                 ^
SELECT * FROM cypher('cypher_match', $$
         MATCH (r1:e1), (r1), (r1:invalid) return r1
$$) AS (r1 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:          MATCH (r1:e1), (r1), (r1:invalid) return r1
                                       ^
SELECT * FROM cypher('cypher_match', $$
        MATCH (r0)-[r0]->() MATCH ()-[]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  variable 'r0' is for a vertex
LINE 2:         MATCH (r0)-[r0]->() MATCH ()-[]->() RETURN r0
                           ^
SELECT * FROM cypher('cypher_match', $$
        MATCH (r0)-[]->() MATCH ()-[r0]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  variable 'r0' is for a vertex
LINE 2:         MATCH (r0)-[]->() MATCH ()-[r0]->() RETURN r0
                                           ^
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0]->() MATCH ()-[]->(r0) RETURN r0
$$) AS (r0 agtype);
ERROR:  variable 'r0' is for an edge
LINE 2:         MATCH ()-[r0]->() MATCH ()-[]->(r0) RETURN r0
                                                ^
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->() MATCH ()-[r0:e2]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  multiple labels for variable 'r0' are not supported
LINE 2:         MATCH ()-[r0:e1]->() MATCH ()-[r0:e2]->() RETURN r0
                                              ^
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0]->() MATCH ()-[r0:e2]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  multiple labels for variable 'r0' are not supported
LINE 2:         MATCH ()-[r0]->() MATCH ()-[r0:e2]->() RETURN r0
                                           ^
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->() MATCH ()-[r0:e2]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  multiple labels for variable 'r0' are not supported
LINE 2:         MATCH ()-[r0:e1]->() MATCH ()-[r0:e2]->() RETURN r0
                                              ^
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->()-[r0]->() MATCH ()-[r0:e2]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  duplicate edge variable 'r0' within a clause
LINE 2:         MATCH ()-[r0:e1]->()-[r0]->() MATCH ()-[r0:e2]->() R...
                                     ^
SELECT * FROM cypher('cypher_match', $$
        MATCH ()-[r0:e1]->()-[r1]->() MATCH ()-[r1:e1]->()-[r0]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:         MATCH ()-[r0:e1]->()-[r1]->() MATCH ()-[r1:e1]->()-[...
                                                       ^
-- Labels that don't exist but do match
SELECT * FROM cypher('cypher_match', $$
        MATCH (r0)-[r1:related]->() MATCH ()-[r1:related]->() RETURN r0
$$) AS (r0 agtype);
 r0 
----
(0 rows)

-- Labels that don't exist and don't match
SELECT * FROM cypher('cypher_match', $$
        MATCH (r0)-[r1]->() MATCH ()-[r1:related]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:         MATCH (r0)-[r1]->() MATCH ()-[r1:related]->() RETURN...
                                             ^
SELECT * FROM cypher('cypher_match', $$
        MATCH (r0)-[r1:related]->() MATCH ()-[r1:relateds]->() RETURN r0
$$) AS (r0 agtype);
ERROR:  multiple labels for variable 'r1' are not supported
LINE 2:         MATCH (r0)-[r1:related]->() MATCH ()-[r1:relateds]->...
                                                     ^
--Valid variable reuse, although why would you want to do it this way?
SELECT * FROM cypher('cypher_match', $$
	MATCH (a:v1)-[]-()-[]-(a {id:'will_not_fail'}) RETURN a
$$) AS (a agtype);
 a 
---
(0 rows)

--Incorrect Labels
SELECT * FROM cypher('cypher_match', $$MATCH (n)-[:v]-() RETURN n$$) AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n)-[:emissing]-() RETURN n$$) AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n:e1)-[]-() RETURN n$$) AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n:vmissing)-[]-() RETURN n$$) AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (:e1)-[r]-() RETURN r$$) AS (r agtype);
 r 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (:vmissing)-[r]-() RETURN r$$) AS (r agtype);
 r 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n),(:e1) RETURN n$$) AS (n agtype);
 n 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$MATCH (n),()-[:v]-() RETURN n$$) AS (n agtype);
 n 
---
(0 rows)

--
-- Path of one vertex. This should select 14
--
SELECT * FROM cypher('cypher_match', $$
       MATCH p=() RETURN p
$$) AS (p agtype);
                                                                                        p                                                                                        
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex]::path
 [{"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex]::path
 [{"id": 844424930131969, "label": "v", "properties": {}}::vertex]::path
 [{"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex]::path
 [{"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex]::path
 [{"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex]::path
 [{"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex]::path
 [{"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex]::path
 [{"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex]::path
 [{"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex]::path
(14 rows)

--
-- MATCH with WHERE EXISTS(pattern)
--
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) RETURN u, e, v $$) AS (u agtype, e agtype, v agtype);
                                        u                                         |                                                             e                                                             |                                        v                                         
----------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex | {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge | {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex  | {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge | {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex  | {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge | {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex  | {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge | {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex | {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex     | {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
(6 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(v)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
                                        u                                         |                                                             e                                                             |                                        v                                         
----------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex | {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge | {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex  | {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge | {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex  | {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge | {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex  | {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge | {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex | {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex     | {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
(6 rows)

-- Property Constraint in EXISTS
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE EXISTS((u)-[]->({id: "middle"})) RETURN u $$)
AS (u agtype);
                                        u                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE EXISTS((u)-[]->({id: "not a valid id"})) RETURN u $$)
AS (u agtype);
 u 
---
(0 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE EXISTS((u)-[]->({id: NULL})) RETURN u $$)
AS (u agtype);
 u 
---
(0 rows)

-- Exists checks for a loop. There shouldn't be any.
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(u)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
 u | e | v 
---+---+---
(0 rows)

-- Create a loop
SELECT * FROM cypher('cypher_match', $$
        CREATE (u:loop {id:'initial'})-[:self]->(u)
$$) AS (a agtype);
 a 
---
(0 rows)

-- dump paths
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(v)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
                                         u                                          |                                                              e                                                              |                                         v                                          
------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex   | {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge   | {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex    | {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge   | {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex    | {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge   | {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex    | {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge   | {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex   | {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge   | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex       | {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge   | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex | {"id": 3096224743817217, "label": "self", "end_id": 2814749767106561, "start_id": 2814749767106561, "properties": {}}::edge | {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(7 rows)

-- Exists checks for a loop. There should be one.
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(u)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
                                         u                                          |                                                              e                                                              |                                         v                                          
------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex | {"id": 3096224743817217, "label": "self", "end_id": 2814749767106561, "start_id": 2814749767106561, "properties": {}}::edge | {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(1 row)

-- Exists checks for a loop. There should be one.
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((v)-[e]->(v)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
                                         u                                          |                                                              e                                                              |                                         v                                          
------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex | {"id": 3096224743817217, "label": "self", "end_id": 2814749767106561, "start_id": 2814749767106561, "properties": {}}::edge | {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(1 row)

-- Multiple exists
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)) AND EXISTS((v)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
                                         u                                          |                                                              e                                                              |                                         v                                          
------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex   | {"id": 1407374883553282, "label": "e1", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {}}::edge   | {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex    | {"id": 1407374883553281, "label": "e1", "end_id": 1125899906842627, "start_id": 1125899906842626, "properties": {}}::edge   | {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex    | {"id": 1970324836974594, "label": "e2", "end_id": 1688849860263937, "start_id": 1688849860263938, "properties": {}}::edge   | {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex    | {"id": 1970324836974593, "label": "e2", "end_id": 1688849860263939, "start_id": 1688849860263938, "properties": {}}::edge   | {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex   | {"id": 2533274790395906, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685249, "properties": {}}::edge   | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex       | {"id": 2533274790395905, "label": "e3", "end_id": 2251799813685250, "start_id": 2251799813685251, "properties": {}}::edge   | {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex | {"id": 3096224743817217, "label": "self", "end_id": 2814749767106561, "start_id": 2814749767106561, "properties": {}}::edge | {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(7 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(u)) AND EXISTS((v)-[e]->(v)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
                                         u                                          |                                                              e                                                              |                                         v                                          
------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex | {"id": 3096224743817217, "label": "self", "end_id": 2814749767106561, "start_id": 2814749767106561, "properties": {}}::edge | {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(1 row)

-- Return exists(pattern)
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) RETURN EXISTS((u)-[]->()) $$)
AS (exists agtype);
 exists 
--------
 false
 false
 false
 false
 false
 true
 true
 false
 false
 true
 false
 true
 false
 true
 true
(15 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) RETURN EXISTS((u)-[e]->(v)-[e]->(u))$$)
AS (exists agtype);
 exists 
--------
 false
 false
 false
 false
 false
 false
 false
(7 rows)

-- These should error
-- Bad pattern
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)) AND EXISTS([e]) AND EXISTS((v)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
ERROR:  syntax error at or near "["
LINE 2: ...$$MATCH (u)-[e]->(v) WHERE EXISTS((u)) AND EXISTS([e]) AND E...
                                                             ^
-- variable creation error
SELECT * FROM cypher('cypher_match',
 $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(x)) RETURN u, e, v $$)
AS (u agtype, e agtype, v agtype);
ERROR:  variable `x` does not exist
LINE 2:  $$MATCH (u)-[e]->(v) WHERE EXISTS((u)-[e]->(x)) RETURN u, e...
                                                     ^
-- path variable not allowed in EXISTS
SELECT * FROM cypher('cypher_match',
 $$MATCH p=(u)-[e]->(v) RETURN EXISTS((p)) $$)
AS (exists agtype);
ERROR:  a path variable 'p' is not allowed here
LINE 2:  $$MATCH p=(u)-[e]->(v) RETURN EXISTS((p)) $$)
                                               ^
--
-- Tests for EXISTS(property)
--
-- dump all vertices
SELECT * FROM cypher('cypher_match', $$MATCH (u) RETURN u $$) AS (u agtype);
                                                                                    u                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
 {"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex
 {"id": 844424930131969, "label": "v", "properties": {}}::vertex
 {"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex
 {"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(15 rows)

-- select vertices with id as a property
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE EXISTS(u.id) RETURN u $$)
AS (u agtype);
                                         u                                          
------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(10 rows)

-- select vertices without id as a property
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE NOT EXISTS(u.id) RETURN u $$)
AS (u agtype);
                                                                                    u                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
 {"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex
 {"id": 844424930131969, "label": "v", "properties": {}}::vertex
 {"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex
 {"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex
(5 rows)

-- select vertices without id as a property but with a property i
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE NOT EXISTS(u.id) AND EXISTS(u.i) RETURN u $$)
AS (u agtype);
                                   u                                   
-----------------------------------------------------------------------
 {"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex
 {"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex
(2 rows)

-- select vertices with id as a property and have a self loop
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE EXISTS(u.id) AND EXISTS((u)-[]->(u)) RETURN u$$)
AS (u agtype);
                                         u                                          
------------------------------------------------------------------------------------
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
(1 row)

-- Return exists(property)
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) RETURN EXISTS(u.id), properties(u) $$)
AS (exists agtype, properties agtype);
 exists |                                                 properties                                                  
--------+-------------------------------------------------------------------------------------------------------------
 false  | {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}
 false  | {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}
 false  | {}
 false  | {"i": 0}
 false  | {"i": 1}
 true   | {"id": "initial"}
 true   | {"id": "middle"}
 true   | {"id": "end"}
 true   | {"id": "initial"}
 true   | {"id": "middle"}
 true   | {"id": "end"}
 true   | {"id": "initial"}
 true   | {"id": "middle"}
 true   | {"id": "end"}
 true   | {"id": "initial"}
(15 rows)

SELECT * FROM cypher('cypher_match',
 $$MATCH (u) RETURN EXISTS(u.name), properties(u) $$)
AS (exists agtype, properties agtype);
 exists |                                                 properties                                                  
--------+-------------------------------------------------------------------------------------------------------------
 false  | {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}
 false  | {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}
 false  | {}
 false  | {"i": 0}
 false  | {"i": 1}
 false  | {"id": "initial"}
 false  | {"id": "middle"}
 false  | {"id": "end"}
 false  | {"id": "initial"}
 false  | {"id": "middle"}
 false  | {"id": "end"}
 false  | {"id": "initial"}
 false  | {"id": "middle"}
 false  | {"id": "end"}
 false  | {"id": "initial"}
(15 rows)

-- should give an error
SELECT * FROM cypher('cypher_match',
 $$MATCH (u) WHERE EXISTS(u) RETURN u$$)
AS (u agtype);
ERROR:  syntax error at or near ")"
LINE 2:  $$MATCH (u) WHERE EXISTS(u) RETURN u$$)
                                   ^
--
-- MATCH with WHERE isEmpty(property)
--
SELECT create_graph('for_isEmpty');
NOTICE:  graph "for_isEmpty" has been created
 create_graph 
--------------
 
(1 row)

-- Create vertices
SELECT * FROM cypher('for_isEmpty',
 $$CREATE (u:for_pred {id:1, type: "empty", list: [], map: {}, string: ""}),
		  (v:for_pred {id:2, type: "filled", list: [1], map: {a:1}, string: "a"}),
		  (w:for_pred)$$)
AS (a agtype);
 a 
---
(0 rows)

-- Match vertices with empty properties
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(u.list) RETURN properties(u) $$)
AS (u agtype);
                                u                                
-----------------------------------------------------------------
 {"id": 1, "map": {}, "list": [], "type": "empty", "string": ""}
(1 row)

SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(u.map) RETURN properties(u) $$)
AS (u agtype);
                                u                                
-----------------------------------------------------------------
 {"id": 1, "map": {}, "list": [], "type": "empty", "string": ""}
(1 row)

SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(u.string) RETURN properties(u) $$)
AS (u agtype);
                                u                                
-----------------------------------------------------------------
 {"id": 1, "map": {}, "list": [], "type": "empty", "string": ""}
(1 row)

-- Match vertices with non-empty properties
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE NOT isEmpty(u.list) RETURN properties(u) $$)
AS (u agtype);
                                    u                                     
--------------------------------------------------------------------------
 {"id": 2, "map": {"a": 1}, "list": [1], "type": "filled", "string": "a"}
(1 row)

SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE NOT isEmpty(u.map) RETURN properties(u) $$)
AS (u agtype);
                                    u                                     
--------------------------------------------------------------------------
 {"id": 2, "map": {"a": 1}, "list": [1], "type": "filled", "string": "a"}
(1 row)

SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE NOT isEmpty(u.string) RETURN properties(u) $$)
AS (u agtype);
                                    u                                     
--------------------------------------------------------------------------
 {"id": 2, "map": {"a": 1}, "list": [1], "type": "filled", "string": "a"}
(1 row)

-- Match vertices with no properties
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(properties(u)) RETURN properties(u) $$)
AS (u agtype);
 u  
----
 {}
(1 row)

-- Match vertices with properties
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE NOT isEmpty(properties(u)) RETURN properties(u) $$)
AS (u agtype);
                                    u                                     
--------------------------------------------------------------------------
 {"id": 1, "map": {}, "list": [], "type": "empty", "string": ""}
 {"id": 2, "map": {"a": 1}, "list": [1], "type": "filled", "string": "a"}
(2 rows)

-- Match vertices with null property (should return nothing since WHERE null)
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(u.tree) RETURN properties(u) $$)
AS (u agtype);
 u 
---
(0 rows)

-- Match and Return bool
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(u.list) RETURN isEmpty(u.list), u.type $$)
AS (b agtype, type agtype);
  b   |  type   
------+---------
 true | "empty"
(1 row)

SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE NOT isEmpty(u.list) RETURN isEmpty(u.list), u.type $$)
AS (b agtype, type agtype);
   b   |   type   
-------+----------
 false | "filled"
(1 row)

-- Return null on null
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) RETURN isEmpty(u.tree) $$)
AS (b agtype);
 b 
---
 
 
 
(3 rows)

-- Should give an error
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(u) RETURN properties(u) $$)
AS (u agtype);
ERROR:  isEmpty() unsupported argument, expected a List, Map, or String
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(1) RETURN properties(u) $$)
AS (u agtype);
ERROR:  isEmpty() unsupported argument, expected a List, Map, or String
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty(1,2,3) RETURN properties(u) $$)
AS (u agtype);
ERROR:  function ag_catalog.age_isempty(agtype, agtype, agtype) does not exist
LINE 2:  $$MATCH (u:for_pred) WHERE isEmpty(1,2,3) RETURN properties...
                                           ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
SELECT * FROM cypher('for_isEmpty',
 $$MATCH (u:for_pred) WHERE isEmpty() RETURN properties(u) $$)
AS (u agtype);
ERROR:  function ag_catalog.age_isempty() does not exist
LINE 2:  $$MATCH (u:for_pred) WHERE isEmpty() RETURN properties(u) $...
                                    ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.
-- clean up
SELECT drop_graph('for_isEmpty', true);
NOTICE:  drop cascades to 3 other objects
DETAIL:  drop cascades to table "for_isEmpty"._ag_label_vertex
drop cascades to table "for_isEmpty"._ag_label_edge
drop cascades to table "for_isEmpty".for_pred
NOTICE:  graph "for_isEmpty" has been dropped
 drop_graph 
------------
 
(1 row)

--
--Distinct
--
SELECT * FROM cypher('cypher_match', $$
	MATCH (u)
	RETURN DISTINCT u.id
$$) AS (i agtype);
     i     
-----------
 
 "end"
 "initial"
 "middle"
(4 rows)

SELECT * FROM cypher('cypher_match', $$
	CREATE (u:duplicate)-[:dup_edge {id:1 }]->(:other_v)
$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (u:duplicate)
	CREATE (u)-[:dup_edge {id:2 }]->(:other_v)
$$) AS (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (u:duplicate)-[]-(:other_v)
	RETURN DISTINCT u
$$) AS (i agtype);
                                    i                                     
--------------------------------------------------------------------------
 {"id": 3377699720527873, "label": "duplicate", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH p=(:duplicate)-[]-(:other_v)
	RETURN DISTINCT p
$$) AS (i agtype);
                                                                                                                                                i                                                                                                                                                 
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 3377699720527873, "label": "duplicate", "properties": {}}::vertex, {"id": 3659174697238529, "label": "dup_edge", "end_id": 3940649673949185, "start_id": 3377699720527873, "properties": {"id": 1}}::edge, {"id": 3940649673949185, "label": "other_v", "properties": {}}::vertex]::path
 [{"id": 3377699720527873, "label": "duplicate", "properties": {}}::vertex, {"id": 3659174697238530, "label": "dup_edge", "end_id": 3940649673949186, "start_id": 3377699720527873, "properties": {"id": 2}}::edge, {"id": 3940649673949186, "label": "other_v", "properties": {}}::vertex]::path
(2 rows)

--
-- Limit
--
SELECT * FROM cypher('cypher_match', $$
	MATCH (u)
	RETURN u
$$) AS (i agtype);
                                                                                    i                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
 {"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex
 {"id": 844424930131969, "label": "v", "properties": {}}::vertex
 {"id": 844424930131970, "label": "v", "properties": {"i": 0}}::vertex
 {"id": 844424930131971, "label": "v", "properties": {"i": 1}}::vertex
 {"id": 1125899906842625, "label": "v1", "properties": {"id": "initial"}}::vertex
 {"id": 1125899906842626, "label": "v1", "properties": {"id": "middle"}}::vertex
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
 {"id": 3377699720527873, "label": "duplicate", "properties": {}}::vertex
 {"id": 3940649673949185, "label": "other_v", "properties": {}}::vertex
 {"id": 3940649673949186, "label": "other_v", "properties": {}}::vertex
(18 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (u)
	RETURN u LIMIT 3
$$) AS (i agtype);
                                                                                    i                                                                                    
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {"int_key": 1, "map_key": {"key": "value"}, "list_key": [1, 2, 3], "float_key": 3.14, "string_key": "test"}}::vertex
 {"id": 281474976710658, "label": "", "properties": {"lst": [1, null, 3.14, "string", {"key": "value"}, []]}}::vertex
 {"id": 844424930131969, "label": "v", "properties": {}}::vertex
(3 rows)

--
-- Skip
--
SELECT * FROM cypher('cypher_match', $$
	MATCH (u)
	RETURN u SKIP 7
$$) AS (i agtype);
                                         i                                          
------------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
 {"id": 1688849860263939, "label": "v2", "properties": {"id": "end"}}::vertex
 {"id": 2251799813685249, "label": "v3", "properties": {"id": "initial"}}::vertex
 {"id": 2251799813685250, "label": "v3", "properties": {"id": "middle"}}::vertex
 {"id": 2251799813685251, "label": "v3", "properties": {"id": "end"}}::vertex
 {"id": 2814749767106561, "label": "loop", "properties": {"id": "initial"}}::vertex
 {"id": 3377699720527873, "label": "duplicate", "properties": {}}::vertex
 {"id": 3940649673949185, "label": "other_v", "properties": {}}::vertex
 {"id": 3940649673949186, "label": "other_v", "properties": {}}::vertex
(11 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (u)
	RETURN u SKIP 7 LIMIT 3
$$) AS (i agtype);
                                        i                                         
----------------------------------------------------------------------------------
 {"id": 1125899906842627, "label": "v1", "properties": {"id": "end"}}::vertex
 {"id": 1688849860263937, "label": "v2", "properties": {"id": "initial"}}::vertex
 {"id": 1688849860263938, "label": "v2", "properties": {"id": "middle"}}::vertex
(3 rows)

--
-- Optional Match
--
SELECT * FROM cypher('cypher_match', $$
    CREATE (:opt_match_v {name: 'someone'})-[:opt_match_e]->(:opt_match_v {name: 'somebody'}),
           (:opt_match_v {name: 'anybody'})-[:opt_match_e]->(:opt_match_v {name: 'nobody'})
$$) AS (u agtype);
 u 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (u:opt_match_v)
    OPTIONAL MATCH (u)-[m]-(l)
    RETURN u.name as u, type(m), l.name as l
    ORDER BY u, m, l
$$) AS (u agtype, m agtype, l agtype);
     u      |       m       |     l      
------------+---------------+------------
 "someone"  | "opt_match_e" | "somebody"
 "somebody" | "opt_match_e" | "someone"
 "anybody"  | "opt_match_e" | "nobody"
 "nobody"   | "opt_match_e" | "anybody"
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    OPTIONAL MATCH (n:opt_match_v)-[r]->(p), (m:opt_match_v)-[s]->(q)
    WHERE id(n) <> id(m)
    RETURN n.name as n, type(r) AS r, p.name as p,
           m.name AS m, type(s) AS s, q.name AS q
    ORDER BY n, p, m, q
$$) AS (n agtype, r agtype, p agtype, m agtype, s agtype, q agtype);
     n     |       r       |     p      |     m     |       s       |     q      
-----------+---------------+------------+-----------+---------------+------------
 "someone" | "opt_match_e" | "somebody" | "anybody" | "opt_match_e" | "nobody"
 "anybody" | "opt_match_e" | "nobody"   | "someone" | "opt_match_e" | "somebody"
(2 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (n:opt_match_v), (m:opt_match_v)
    WHERE id(n) <> id(m)
    OPTIONAL MATCH (n)-[r]->(p), (m)-[s]->(q)
    RETURN n.name AS n, type(r) AS r, p.name AS p,
           m.name AS m, type(s) AS s, q.name AS q
    ORDER BY n, p, m, q
 $$) AS (n agtype, r agtype, p agtype, m agtype, s agtype, q agtype);
     n      |       r       |     p      |     m      |       s       |     q      
------------+---------------+------------+------------+---------------+------------
 "someone"  | "opt_match_e" | "somebody" | "anybody"  | "opt_match_e" | "nobody"
 "someone"  |               |            | "somebody" |               | 
 "someone"  |               |            | "nobody"   |               | 
 "somebody" |               |            | "someone"  |               | 
 "somebody" |               |            | "anybody"  |               | 
 "somebody" |               |            | "nobody"   |               | 
 "anybody"  | "opt_match_e" | "nobody"   | "someone"  | "opt_match_e" | "somebody"
 "anybody"  |               |            | "somebody" |               | 
 "anybody"  |               |            | "nobody"   |               | 
 "nobody"   |               |            | "someone"  |               | 
 "nobody"   |               |            | "somebody" |               | 
 "nobody"   |               |            | "anybody"  |               | 
(12 rows)

-- Tests to catch match following optional match logic
-- this syntax is invalid in cypher
SELECT * FROM cypher('cypher_match', $$
	OPTIONAL MATCH (n)
    MATCH (m)
    RETURN n,m
 $$) AS (n agtype, m agtype);
ERROR:  MATCH cannot follow OPTIONAL MATCH
LINE 1: SELECT * FROM cypher('cypher_match', $$
                                              ^
SELECT * FROM cypher('cypher_match', $$
	MATCH (n)
	OPTIONAL MATCH (m)
    MATCH (o)
    RETURN n,m
 $$) AS (n agtype, m agtype);
ERROR:  MATCH cannot follow OPTIONAL MATCH
LINE 1: SELECT * FROM cypher('cypher_match', $$
                                              ^
--
-- Tests retrieving Var from some parent's cpstate during transformation
--
SELECT create_graph('test_retrieve_var');
NOTICE:  graph "test_retrieve_var" has been created
 create_graph 
--------------
 
(1 row)

SELECT * FROM cypher('test_retrieve_var', $$ CREATE (:A)-[:incs]->(:C) $$) as (a agtype);
 a 
---
(0 rows)

-- Tests with node Var
-- both queries should return the same result
-- first query does not retrieve any variable from any parent's cpstate
-- second query retrieves variable 'a', inside WHERE, from parent's parent's cpstate
SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A) WITH a
    OPTIONAL MATCH (a)-[:incs]->(c)
    WHERE EXISTS((c)<-[:incs]-())
    RETURN a, c
$$) AS (a agtype, c agtype);
                                a                                |                                c                                 
-----------------------------------------------------------------+------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1407374883553281, "label": "C", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A) WITH a
    OPTIONAL MATCH (a)-[:incs]->(c)
    WHERE EXISTS((c)<-[:incs]-(a))
    RETURN a, c
$$) AS (a agtype, c agtype);
                                a                                |                                c                                 
-----------------------------------------------------------------+------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1407374883553281, "label": "C", "properties": {}}::vertex
(1 row)

-- Tests with edge Var
-- both queries should return the same result
-- first query does not retrieve any variable from any parent's cpstate
-- second query retrieves variable 'r', inside WHERE, from parent's parent's cpstate
SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A)-[r:incs]->() WITH a, r
    OPTIONAL MATCH (a)-[r]->(c)
    WHERE EXISTS(()<-[]-(c))
    RETURN a, r
$$) AS (a agtype, r agtype);
                                a                                |                                                             r                                                              
-----------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1125899906842625, "label": "incs", "end_id": 1407374883553281, "start_id": 844424930131969, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A)-[r:incs]->() WITH a, r
    OPTIONAL MATCH (a)-[r]->(c)
    WHERE EXISTS((:A)<-[]-(c))
    RETURN a, r
$$) AS (a agtype, r agtype);
                                a                                |                                                             r                                                              
-----------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1125899906842625, "label": "incs", "end_id": 1407374883553281, "start_id": 844424930131969, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A)-[r:incs]->() WITH a, r
    OPTIONAL MATCH (a)-[r]->(c)
    WHERE EXISTS((c)<-[]-(:A))
    RETURN a, r
$$) AS (a agtype, r agtype);
                                a                                |                                                             r                                                              
-----------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1125899906842625, "label": "incs", "end_id": 1407374883553281, "start_id": 844424930131969, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A)-[r:incs]->() WITH a, r
    OPTIONAL MATCH (a)-[r]->(c)
    WHERE EXISTS((:C)<-[]-(:A))
    RETURN a, r
$$) AS (a agtype, r agtype);
                                a                                |                                                             r                                                              
-----------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1125899906842625, "label": "incs", "end_id": 1407374883553281, "start_id": 844424930131969, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('test_retrieve_var', $$
    MATCH (a:A)-[r:incs]->() WITH a, r
    OPTIONAL MATCH (a)-[r]->(c)
    WHERE EXISTS(()<-[r]-(c))
    RETURN a, r
$$) AS (a agtype, r agtype);
                                a                                |                                                             r                                                              
-----------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "A", "properties": {}}::vertex | {"id": 1125899906842625, "label": "incs", "end_id": 1407374883553281, "start_id": 844424930131969, "properties": {}}::edge
(1 row)

--
-- JIRA: AGE2-544
--
-- Clean up
SELECT DISTINCT * FROM cypher('cypher_match', $$
    MATCH (u) DETACH DELETE (u)
$$) AS (i agtype);
 i 
---
(0 rows)

-- Prepare
SELECT * FROM cypher('cypher_match', $$
    CREATE (u {name: "orphan"})
    CREATE (u1 {name: "F"})-[u2:e1]->(u3 {name: "T"})
    RETURN u1, u2, u3
$$) as (u1 agtype, u2 agtype, u3 agtype);
                                    u1                                     |                                                           u2                                                            |                                    u3                                     
---------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------
 {"id": 281474976710660, "label": "", "properties": {"name": "F"}}::vertex | {"id": 1407374883553283, "label": "e1", "end_id": 281474976710661, "start_id": 281474976710660, "properties": {}}::edge | {"id": 281474976710661, "label": "", "properties": {"name": "T"}}::vertex
(1 row)

-- Querying NOT EXISTS syntax
SELECT * FROM cypher('cypher_match', $$
     MATCH (f),(t)
     WHERE NOT EXISTS((f)-[]->(t))
     RETURN f.name, t.name
 $$) as (f agtype, t agtype);
    f     |    t     
----------+----------
 "orphan" | "orphan"
 "orphan" | "F"
 "orphan" | "T"
 "F"      | "orphan"
 "F"      | "F"
 "T"      | "orphan"
 "T"      | "F"
 "T"      | "T"
(8 rows)

-- Querying EXISTS syntax
SELECT * FROM cypher('cypher_match', $$
    MATCH (f),(t)
    WHERE EXISTS((f)-[]->(t))
    RETURN f.name, t.name
 $$) as (f agtype, t agtype);
  f  |  t  
-----+-----
 "F" | "T"
(1 row)

-- Querying ALL
SELECT * FROM cypher('cypher_match', $$
    MATCH (f),(t)
    WHERE NOT EXISTS((f)-[]->(t)) or true
    RETURN f.name, t.name
$$) as (f agtype, t agtype);
    f     |    t     
----------+----------
 "orphan" | "orphan"
 "orphan" | "F"
 "orphan" | "T"
 "F"      | "orphan"
 "F"      | "F"
 "F"      | "T"
 "T"      | "orphan"
 "T"      | "F"
 "T"      | "T"
(9 rows)

-- Querying ALL
SELECT * FROM cypher('cypher_match', $$
    MATCH (f),(t)
    RETURN f.name, t.name
$$) as (f agtype, t agtype);
    f     |    t     
----------+----------
 "orphan" | "orphan"
 "orphan" | "F"
 "orphan" | "T"
 "F"      | "orphan"
 "F"      | "F"
 "F"      | "T"
 "T"      | "orphan"
 "T"      | "F"
 "T"      | "T"
(9 rows)

--
-- Constraints and WHERE clause together
--
SELECT * FROM cypher('cypher_match', $$
    CREATE ({i: 1, j: 2, k: 3}), ({i: 1, j: 3}), ({i:2, k: 3})
$$) as (a agtype);
 a 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (n {j: 2})
    WHERE n.i = 1
    RETURN n
$$) as (n agtype);
                                          n                                           
--------------------------------------------------------------------------------------
 {"id": 281474976710662, "label": "", "properties": {"i": 1, "j": 2, "k": 3}}::vertex
(1 row)

--
-- Regression tests to check previous clause variable refs
--
-- set up initial state and show what we're working with
SELECT * FROM cypher('cypher_match', $$
    CREATE (a {age: 4}) RETURN a $$) as (a agtype);
                                   a                                    
------------------------------------------------------------------------
 {"id": 281474976710665, "label": "", "properties": {"age": 4}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	CREATE (b {age: 6}) RETURN b $$) as (b agtype);
                                   b                                    
------------------------------------------------------------------------
 {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) RETURN a $$) as (a agtype);
                                          a                                           
--------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"name": "orphan"}}::vertex
 {"id": 281474976710660, "label": "", "properties": {"name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"name": "T"}}::vertex
 {"id": 281474976710662, "label": "", "properties": {"i": 1, "j": 2, "k": 3}}::vertex
 {"id": 281474976710663, "label": "", "properties": {"i": 1, "j": 3}}::vertex
 {"id": 281474976710664, "label": "", "properties": {"i": 2, "k": 3}}::vertex
 {"id": 281474976710665, "label": "", "properties": {"age": 4}}::vertex
 {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex
(8 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) WHERE EXISTS(a.name) RETURN a $$) as (a agtype);
                                       a                                        
--------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"name": "orphan"}}::vertex
 {"id": 281474976710660, "label": "", "properties": {"name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"name": "T"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) WHERE EXISTS(a.name) SET a.age = 4 RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 4, "name": "orphan"}}::vertex
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a),(b) WHERE a.age = 4 AND a.name = "T" AND b.age = 6
	RETURN a,b $$) as (a agtype, b agtype);
                                          a                                          |                                   b                                    
-------------------------------------------------------------------------------------+------------------------------------------------------------------------
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex | {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a),(b) WHERE a.age = 4 AND a.name = "T" AND b.age = 6 CREATE
	(a)-[:knows {relationship: "friends", years: 3}]->(b) $$) as (r agtype);
 r 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a),(b) WHERE a.age = 4 AND a.name = "orphan" AND b.age = 6 CREATE
	(a)-[:knows {relationship: "enemies", years: 4}]->(b) $$) as (r agtype);
 r 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH (a)-[r]-(b) RETURN r $$) as (r agtype);
                                                                                r                                                                                
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 1407374883553283, "label": "e1", "end_id": 281474976710661, "start_id": 281474976710660, "properties": {}}::edge
 {"id": 1407374883553283, "label": "e1", "end_id": 281474976710661, "start_id": 281474976710660, "properties": {}}::edge
(6 rows)

-- check reuse of 'a' clause-to-clause - vertices
SELECT * FROM cypher('cypher_match', $$
    MATCH (a {age:4}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710665, "label": "", "properties": {"age": 4}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 4, "name": "orphan"}}::vertex
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) MATCH (a {age:4}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710665, "label": "", "properties": {"age": 4}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 4, "name": "orphan"}}::vertex
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
(4 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a {age:4, name: "orphan"}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 4, "name": "orphan"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) MATCH (a {age:4}) MATCH (a {name: "orphan"}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 4, "name": "orphan"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a {age:4}) MATCH (a {name: "orphan"}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 4, "name": "orphan"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) MATCH (a {age:4}) MATCH (a {name: "orphan"}) SET a.age = 3 RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) MATCH (a {age:3}) MATCH (a {name: "orphan"}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a {name: "orphan"}) MATCH (a {age:3}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) WHERE EXISTS(a.age) AND EXISTS(a.name) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$
    MATCH (a) WHERE EXISTS(a.age) AND NOT EXISTS(a.name) RETURN a $$) as (a agtype);
                                   a                                    
------------------------------------------------------------------------
 {"id": 281474976710665, "label": "", "properties": {"age": 4}}::vertex
 {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex
(2 rows)

-- check reuse of 'r' clause-to-clause - edges
SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r]-() RETURN r $$) as (r agtype);
                                                                                r                                                                                
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 1407374883553283, "label": "e1", "end_id": 281474976710661, "start_id": 281474976710660, "properties": {}}::edge
 {"id": 1407374883553283, "label": "e1", "end_id": 281474976710661, "start_id": 281474976710660, "properties": {}}::edge
(6 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r]-() MATCH ()-[r {relationship: "friends"}]-() RETURN r $$) as (r agtype);
                                                                                r                                                                                
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
(4 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r {years:3, relationship: "friends"}]-() RETURN r $$) as (r agtype);
                                                                                r                                                                                
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
(2 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r {years:3}]-() MATCH ()-[r {relationship: "friends"}]-() RETURN r $$) as (r agtype);
                                                                                r                                                                                
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
 {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge
(4 rows)

--mismatch year #, should return nothing
SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r {years:2}]-() MATCH ()-[r {relationship: "friends"}]-() RETURN r $$) as (r agtype);
 r 
---
(0 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r {relationship:"enemies"}]-() MATCH ()-[r {years:4}]-() RETURN r $$) as (r agtype);
                                                                                r                                                                                
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
 {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge
(4 rows)

SELECT * FROM cypher('cypher_match', $$
	MATCH ()-[r {relationship:"enemies"}]-() MATCH ()-[r {relationship:"friends"}]-() RETURN r $$) as (r agtype);
 r 
---
(0 rows)

-- check reuse within clause - vertices
SELECT * FROM cypher('cypher_match', $$ CREATE (u {name: "Dave"})-[:knows]->({name: "John"})-[:knows]->(u) RETURN u $$) as (u agtype);
                                      u                                       
------------------------------------------------------------------------------
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(u)-[]-()-[]-(u) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex]::path
 [{"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex]::path
 [{"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex]::path
 [{"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex]::path
(4 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(u)-[]->()-[]->(u) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex]::path
 [{"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex]::path
(2 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[]->()-[]->(a {name: "Dave"}) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[]->()-[]->(a {name: "John"}) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a {name: "Dave"})-[]->()-[]->(a {name: "Dave"}) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a {name: "John"})-[]->()-[]->(a {name: "John"}) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a {name: "Dave"})-[]->()-[]->(a) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex]::path
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a {name: "John"})-[]->()-[]->(a) RETURN p $$)as (p agtype);
                                                                                                                                                                                                                                                    p                                                                                                                                                                                                                                                     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex, {"id": 4785074604081155, "label": "knows", "end_id": 281474976710667, "start_id": 281474976710668, "properties": {}}::edge, {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex, {"id": 4785074604081156, "label": "knows", "end_id": 281474976710668, "start_id": 281474976710667, "properties": {}}::edge, {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex]::path
(1 row)

-- these are illegal and should fail
SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[b]->()-[b:knows]->(a) RETURN p $$)as (p agtype);
ERROR:  duplicate edge variable 'b' within a clause
LINE 1: ...ROM cypher('cypher_match', $$ MATCH p=(a)-[b]->()-[b:knows]-...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[b]->()-[b]->(a) RETURN p $$)as (p agtype);
ERROR:  duplicate edge variable 'b' within a clause
LINE 1: ...ROM cypher('cypher_match', $$ MATCH p=(a)-[b]->()-[b]->(a) R...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[b:knows]->()-[b:knows]->(a) RETURN p $$)as (p agtype);
ERROR:  duplicate edge variable 'b' within a clause
LINE 1: ...pher('cypher_match', $$ MATCH p=(a)-[b:knows]->()-[b:knows]-...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[b:knows]->()-[b]->(a) RETURN p $$)as (p agtype);
ERROR:  duplicate edge variable 'b' within a clause
LINE 1: ...pher('cypher_match', $$ MATCH p=(a)-[b:knows]->()-[b]->(a) R...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=(p) RETURN p $$)as (p agtype);
ERROR:  variable "p" is for a path
LINE 1: SELECT * FROM cypher('cypher_match', $$ MATCH p=(p) RETURN p...
                                                         ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=(p)-[]->() RETURN p $$)as (p agtype);
ERROR:  variable "p" is for a path
LINE 1: SELECT * FROM cypher('cypher_match', $$ MATCH p=(p)-[]->() R...
                                                         ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=()-[p]->() RETURN p $$)as (p agtype);
ERROR:  variable "p" is for a path
LINE 1: ...ELECT * FROM cypher('cypher_match', $$ MATCH p=()-[p]->() RE...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=() MATCH (p) RETURN p $$)as (p agtype);
ERROR:  variable 'p' is for a path
LINE 1: ... FROM cypher('cypher_match', $$ MATCH p=() MATCH (p) RETURN ...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=() MATCH (p)-[]->() RETURN p $$)as (p agtype);
ERROR:  variable 'p' is for a path
LINE 1: ... FROM cypher('cypher_match', $$ MATCH p=() MATCH (p)-[]->() ...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=() MATCH ()-[p]->() RETURN p $$)as (p agtype);
ERROR:  variable 'p' is for a path
LINE 1: ...ROM cypher('cypher_match', $$ MATCH p=() MATCH ()-[p]->() RE...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH (p) MATCH p=() RETURN p $$)as (p agtype);
ERROR:  variable "p" already exists
LINE 1: ... * FROM cypher('cypher_match', $$ MATCH (p) MATCH p=() RETUR...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH ()-[p]->() MATCH p=() RETURN p $$)as (p agtype);
ERROR:  variable "p" already exists
LINE 1: ... cypher('cypher_match', $$ MATCH ()-[p]->() MATCH p=() RETUR...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH ()-[p *]-()-[p]-() RETURN 0 $$)as (p agtype);
ERROR:  variable 'p' is for a VLE edge
LINE 1: ... FROM cypher('cypher_match', $$ MATCH ()-[p *]-()-[p]-() RET...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ CREATE (p) WITH p MATCH p=() RETURN p $$)as (p agtype);
ERROR:  variable "p" already exists
LINE 1: ...cypher('cypher_match', $$ CREATE (p) WITH p MATCH p=() RETUR...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ CREATE p=() WITH p MATCH (p) RETURN p $$)as (p agtype);
ERROR:  variable 'p' already exists
LINE 1: ...pher('cypher_match', $$ CREATE p=() WITH p MATCH (p) RETURN ...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ CREATE ()-[p:knows]->() WITH p MATCH p=() RETURN p $$)as (p agtype);
ERROR:  variable "p" already exists
LINE 1: ...r_match', $$ CREATE ()-[p:knows]->() WITH p MATCH p=() RETUR...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ CREATE p=() WITH p MATCH ()-[p]->() RETURN p $$)as (p agtype);
ERROR:  variable 'p' already exists
LINE 1: ...er('cypher_match', $$ CREATE p=() WITH p MATCH ()-[p]->() RE...
                                                             ^
--
-- Default alias check (issue #883)
--
SELECT * FROM cypher('cypher_match', $$ MATCH (_) RETURN _ $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710662, "label": "", "properties": {"i": 1, "j": 2, "k": 3}}::vertex
 {"id": 281474976710663, "label": "", "properties": {"i": 1, "j": 3}}::vertex
 {"id": 281474976710664, "label": "", "properties": {"i": 2, "k": 3}}::vertex
 {"id": 281474976710665, "label": "", "properties": {"age": 4}}::vertex
 {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex
(10 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH () MATCH (_{name: "Dave"}) RETURN 0 $$) as (a agtype);
 a 
---
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
(10 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH () MATCH (_{name: "Dave"}) RETURN _ $$) as (a agtype);
                                      a                                       
------------------------------------------------------------------------------
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
(10 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH (my_age_default_{name: "Dave"}) RETURN my_age_default_$$) as (a agtype);
                                      a                                       
------------------------------------------------------------------------------
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
(1 row)

SELECT * FROM cypher('cypher_match', $$ MATCH () MATCH (my_age_default_{name: "Dave"}) RETURN my_age_default_$$) as (a agtype);
                                      a                                       
------------------------------------------------------------------------------
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
(10 rows)

-- these should fail as they are prefixed with _age_default_ which is only for internal use
SELECT * FROM cypher('cypher_match', $$ MATCH (_age_default_) RETURN _age_default_ $$) as (a agtype);
ERROR:  _age_default_ is only for internal use
LINE 1: SELECT * FROM cypher('cypher_match', $$ MATCH (_age_default_...
                                                       ^
SELECT * FROM cypher('cypher_match', $$ MATCH (_age_default_a) RETURN _age_default_a $$) as (a agtype);
ERROR:  _age_default_ is only for internal use
LINE 1: SELECT * FROM cypher('cypher_match', $$ MATCH (_age_default_...
                                                       ^
SELECT * FROM cypher('cypher_match', $$ MATCH (_age_default_whatever) RETURN 0 $$) as (a agtype);
ERROR:  _age_default_ is only for internal use
LINE 1: SELECT * FROM cypher('cypher_match', $$ MATCH (_age_default_...
                                                       ^
-- issue 876
SELECT * FROM cypher('cypher_match', $$ MATCH ({name: "Dave"}) MATCH ({name: "Dave"}) MATCH ({name: "Dave"}) RETURN 0 $$) as (a agtype);
 a 
---
 0
(1 row)

SELECT * FROM cypher('cypher_match', $$MATCH ({n0:0}) MATCH ()-[]->() MATCH ({n1:0})-[]-() RETURN 0 AS n2$$) as (a agtype);
 a 
---
(0 rows)

--
-- self referencing property constraints (issue #898)
--
SELECT * FROM cypher('cypher_match', $$ MATCH (a {name:a.name}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
 {"id": 281474976710667, "label": "", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710668, "label": "", "properties": {"name": "John"}}::vertex
(5 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH (a {name:a.name, age:a.age}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH (a {name:a.name}) MATCH (a {age:a.age}) RETURN a $$) as (a agtype);
                                            a                                             
------------------------------------------------------------------------------------------
 {"id": 281474976710660, "label": "", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex
 {"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[u {relationship: u.relationship}]->(b) RETURN p $$) as (a agtype);
                                                                                                                                                                     a                                                                                                                                                                     
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex, {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge, {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex]::path
 [{"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex, {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge, {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex]::path
(2 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a)-[u {relationship: u.relationship, years: u.years}]->(b) RETURN p $$) as (a agtype);
                                                                                                                                                                     a                                                                                                                                                                     
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex, {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge, {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex]::path
 [{"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex, {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge, {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex]::path
(2 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=(a {name:a.name})-[u {relationship: u.relationship}]->(b {age:b.age}) RETURN p $$) as (a agtype);
                                                                                                                                                                     a                                                                                                                                                                     
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"id": 281474976710661, "label": "", "properties": {"age": 4, "name": "T"}}::vertex, {"id": 4785074604081153, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710661, "properties": {"years": 3, "relationship": "friends"}}::edge, {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex]::path
 [{"id": 281474976710659, "label": "", "properties": {"age": 3, "name": "orphan"}}::vertex, {"id": 4785074604081154, "label": "knows", "end_id": 281474976710666, "start_id": 281474976710659, "properties": {"years": 4, "relationship": "enemies"}}::edge, {"id": 281474976710666, "label": "", "properties": {"age": 6}}::vertex]::path
(2 rows)

SELECT * FROM cypher('cypher_match', $$ CREATE () WITH * MATCH (x{n0:x.n1}) RETURN 0 $$) as (a agtype);
 a 
---
(0 rows)

-- these should fail due to multiple labels for a variable
SELECT * FROM cypher('cypher_match', $$ MATCH p=(x)-[]->(x:R) RETURN p, x $$) AS (p agtype, x agtype);
ERROR:  multiple labels for variable 'x' are not supported
LINE 1: ...* FROM cypher('cypher_match', $$ MATCH p=(x)-[]->(x:R) RETUR...
                                                             ^
SELECT * FROM cypher('cypher_match', $$ MATCH p=(x:r)-[]->(x:R) RETURN p, x $$) AS (p agtype, x agtype);
ERROR:  multiple labels for variable 'x' are not supported
LINE 1: ...FROM cypher('cypher_match', $$ MATCH p=(x:r)-[]->(x:R) RETUR...
                                                             ^
--
-- Test age.enable_containment configuration parameter
--
-- Test queries are run before and after switching off this parameter.
-- When  on, the containment operator should be used to filter properties.
-- When off, the access operator should be used.
--
SELECT create_graph('test_enable_containment');
NOTICE:  graph "test_enable_containment" has been created
 create_graph 
--------------
 
(1 row)

SELECT * FROM cypher('test_enable_containment',
$$
    CREATE (x:Customer {
        name: 'Bob',
        school: {
            name: 'XYZ College',
            program: {
                major: 'Psyc',
                degree: 'BSc'
            }
        },
        phone: [ 123456789, 987654321, 456987123 ],
        addr: [
            {city: 'Vancouver', street: 30},
            {city: 'Toronto', street: 40}
        ]
    })
    RETURN x
$$) as (a agtype);
                                                                                                                                                  a                                                                                                                                                  
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "Customer", "properties": {"addr": [{"city": "Vancouver", "street": 30}, {"city": "Toronto", "street": 40}], "name": "Bob", "phone": [123456789, 987654321, 456987123], "school": {"name": "XYZ College", "program": {"major": "Psyc", "degree": "BSc"}}}}::vertex
(1 row)

-- With enable_containment on
SET age.enable_containment = on;
SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {addr:[{city:'Toronto'}]}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {addr:[{city:'Toronto'}, {city: 'Vancouver'}]}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {addr:[{city:'Alberta'}]}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {school:{program:{major:'Psyc'}}}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {name:'Bob',school:{program:{degree:'BSc'}}}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {school:{program:{major:'Cs'}}}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {name:'Bob',school:{program:{degree:'PHd'}}}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {phone:[987654321]}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {phone:[654765876]}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT * FROM cypher('test_enable_containment', $$ EXPLAIN (COSTS OFF) MATCH (x:Customer {school:{name:'XYZ',program:{degree:'BSc'}},phone:[987654321],parents:{}}) RETURN x $$) as (a agtype);
                                                             QUERY PLAN                                                             
------------------------------------------------------------------------------------------------------------------------------------
 Seq Scan on "Customer" x
   Filter: (properties @> '{"phone": [987654321], "school": {"name": "XYZ", "program": {"degree": "BSc"}}, "parents": {}}'::agtype)
(2 rows)

-- Previous set of queries, with enable_containment off
SET age.enable_containment = off;
SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {addr:[{city:'Toronto'}]}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {addr:[{city:'Toronto'}, {city: 'Vancouver'}]}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {addr:[{city:'Alberta'}]}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {school:{program:{major:'Psyc'}}}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {name:'Bob',school:{program:{degree:'BSc'}}}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {school:{program:{major:'Cs'}}}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {name:'Bob',school:{program:{degree:'PHd'}}}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {phone:[987654321]}) RETURN x $$) as (a agtype);
 count 
-------
     1
(1 row)

SELECT count(*) FROM cypher('test_enable_containment', $$ MATCH (x:Customer {phone:[654765876]}) RETURN x $$) as (a agtype);
 count 
-------
     0
(1 row)

SELECT * FROM cypher('test_enable_containment', $$ EXPLAIN (COSTS OFF) MATCH (x:Customer {school:{name:'XYZ',program:{degree:'BSc'}},phone:[987654321],parents:{}}) RETURN x $$) as (a agtype);
                                                                                                                                                                                                                             QUERY PLAN                                                                                                                                                                                                                              
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Seq Scan on "Customer" x
   Filter: ((agtype_access_operator(VARIADIC ARRAY[properties, '"school"'::agtype, '"name"'::agtype]) = '"XYZ"'::agtype) AND (agtype_access_operator(VARIADIC ARRAY[properties, '"school"'::agtype, '"program"'::agtype, '"degree"'::agtype]) = '"BSc"'::agtype) AND (agtype_access_operator(VARIADIC ARRAY[properties, '"phone"'::agtype]) @> '[987654321]'::agtype) AND (agtype_access_operator(VARIADIC ARRAY[properties, '"parents"'::agtype]) @> '{}'::agtype))
(2 rows)

--
-- Issue 945
--
SELECT create_graph('issue_945');
NOTICE:  graph "issue_945" has been created
 create_graph 
--------------
 
(1 row)

SELECT * FROM cypher('issue_945', $$
    CREATE (a:Part {part_num: '123'}),
           (b:Part {part_num: '345'}),
           (c:Part {part_num: '456'}),
           (d:Part {part_num: '789'})
    $$) as (result agtype);
 result 
--------
(0 rows)

-- should match 4
SELECT * FROM cypher('issue_945', $$
    MATCH (a:Part) RETURN a
    $$) as (result agtype);
                                       result                                        
-------------------------------------------------------------------------------------
 {"id": 844424930131969, "label": "Part", "properties": {"part_num": "123"}}::vertex
 {"id": 844424930131970, "label": "Part", "properties": {"part_num": "345"}}::vertex
 {"id": 844424930131971, "label": "Part", "properties": {"part_num": "456"}}::vertex
 {"id": 844424930131972, "label": "Part", "properties": {"part_num": "789"}}::vertex
(4 rows)

-- each should return 4
SELECT * FROM cypher('issue_945', $$ MATCH (:Part) RETURN count(*) $$) as (result agtype);
 result 
--------
 4
(1 row)

SELECT * FROM cypher('issue_945', $$ MATCH (a:Part) RETURN count(*) $$) as (result agtype);
 result 
--------
 4
(1 row)

-- each should return 4 rows of 0
SELECT * FROM cypher('issue_945', $$ MATCH (:Part) RETURN 0 $$) as (result agtype);
 result 
--------
 0
 0
 0
 0
(4 rows)

SELECT * FROM cypher('issue_945', $$ MATCH (a:Part) RETURN 0 $$) as (result agtype);
 result 
--------
 0
 0
 0
 0
(4 rows)

-- each should return 16 rows of 0
SELECT * FROM cypher('issue_945', $$ MATCH (:Part) MATCH (:Part) RETURN 0 $$) as (result agtype);
 result 
--------
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
(16 rows)

SELECT * FROM cypher('issue_945', $$ MATCH (a:Part) MATCH (:Part) RETURN 0 $$) as (result agtype);
 result 
--------
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
(16 rows)

SELECT * FROM cypher('issue_945', $$ MATCH (:Part) MATCH (b:Part) RETURN 0 $$) as (result agtype);
 result 
--------
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
(16 rows)

SELECT * FROM cypher('issue_945', $$ MATCH (a:Part) MATCH (b:Part) RETURN 0 $$) as (result agtype);
 result 
--------
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
(16 rows)

-- each should return a count of 16
SELECT * FROM cypher('issue_945', $$ MATCH (:Part) MATCH (:Part) RETURN count(*) $$) as (result agtype);
 result 
--------
 16
(1 row)

SELECT * FROM cypher('issue_945', $$ MATCH (a:Part) MATCH (:Part) RETURN count(*) $$) as (result agtype);
 result 
--------
 16
(1 row)

SELECT * FROM cypher('issue_945', $$ MATCH (:Part) MATCH (b:Part) RETURN count(*) $$) as (result agtype);
 result 
--------
 16
(1 row)

SELECT * FROM cypher('issue_945', $$ MATCH (a:Part) MATCH (b:Part) RETURN count(*) $$) as (result agtype);
 result 
--------
 16
(1 row)

--
-- Issue 1045
--
SELECT * FROM cypher('cypher_match', $$ MATCH p=()-[*]->() RETURN length(p) $$) as (length agtype);
 length 
--------
 1
 2
 1
 1
 1
 2
 1
 2
(8 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=()-[*]->() WHERE length(p) > 1 RETURN length(p) $$) as (length agtype);
 length 
--------
 2
 2
 2
(3 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p=()-[*]->() WHERE size(nodes(p)) = 3 RETURN nodes(p)[0] $$) as (nodes agtype);
                                                nodes                                                
-----------------------------------------------------------------------------------------------------
 {"id": 281474976710660, "label": "_ag_label_vertex", "properties": {"age": 4, "name": "F"}}::vertex
 {"id": 281474976710667, "label": "_ag_label_vertex", "properties": {"name": "Dave"}}::vertex
 {"id": 281474976710668, "label": "_ag_label_vertex", "properties": {"name": "John"}}::vertex
(3 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH (n {name:'Dave'}) MATCH p=()-[*]->() WHERE nodes(p)[0] = n RETURN length(p) $$) as (length agtype);
 length 
--------
 1
 2
(2 rows)

SELECT * FROM cypher('cypher_match', $$ MATCH p1=(n {name:'Dave'})-[]->() MATCH p2=()-[*]->() WHERE p2=p1 RETURN p2=p1 $$) as (path agtype);
 path 
------
 true
(1 row)

--
-- Issue 1399 EXISTS leads to an error if a relation label does not exists as database table
--
SELECT create_graph('issue_1399');
NOTICE:  graph "issue_1399" has been created
 create_graph 
--------------
 
(1 row)

-- this is an empty graph so these should return 0
SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[]->())
  RETURN foo
$$) as (c agtype);
 c 
---
(0 rows)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[]->())
  RETURN foo
$$) as (c agtype);
 c 
---
(0 rows)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[:BAR]->())
  RETURN foo
$$) as (c agtype);
 c 
---
(0 rows)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[:BAR]->())
  RETURN foo
$$) as (c agtype);
 c 
---
(0 rows)

-- this is an empty graph so these should return false
SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[]->())
  RETURN count(foo) > 0
$$) as (c agtype);
   c   
-------
 false
(1 row)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[]->())
  RETURN count(foo) > 0
$$) as (c agtype);
   c   
-------
 false
(1 row)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[:BAR]->())
  RETURN count(foo) > 0
$$) as (c agtype);
   c   
-------
 false
(1 row)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[:BAR]->())
  RETURN count(foo) > 0
$$) as (c agtype);
   c   
-------
 false
(1 row)

-- create 1 path
SELECT * FROM cypher('issue_1399', $$
  CREATE (foo)-[:BAR]->() RETURN foo
$$) as (c agtype);
                               c                                
----------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {}}::vertex
(1 row)

-- these should each return 1 row as it is a directed edge and
-- only one vertex can match.
SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[]->())
  RETURN foo
$$) as (c agtype);
                               c                                
----------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[]->())
  RETURN foo
$$) as (c agtype);
                               c                                
----------------------------------------------------------------
 {"id": 281474976710658, "label": "", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[:BAR]->())
  RETURN foo
$$) as (c agtype);
                               c                                
----------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[:BAR]->())
  RETURN foo
$$) as (c agtype);
                               c                                
----------------------------------------------------------------
 {"id": 281474976710658, "label": "", "properties": {}}::vertex
(1 row)

-- this should return 0 rows as it can't exist - that path isn't in BAR2
SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE EXISTS((foo)-[:BAR2]->())
  RETURN foo
$$) as (c agtype);
 c 
---
(0 rows)

-- this should return 2 rows as they all exist
SELECT * FROM cypher('issue_1399', $$
  MATCH (foo)
  WHERE NOT EXISTS((foo)-[:BAR2]->())
  RETURN foo
$$) as (c agtype);
                               c                                
----------------------------------------------------------------
 {"id": 281474976710657, "label": "", "properties": {}}::vertex
 {"id": 281474976710658, "label": "", "properties": {}}::vertex
(2 rows)

-- Issue 1393 EXISTS doesn't see previous clauses' variables
SELECT FROM create_graph('issue_1393');
NOTICE:  graph "issue_1393" has been created
--
(1 row)

SELECT * FROM cypher('issue_1393', $$
  CREATE (n1:Object) RETURN n1
$$) AS (n1 agtype);
                                  n1                                  
----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
(1 row)

-- vertex cases
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1)-[]->(n2)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
 n1 | n2 
----+----
(0 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1:Object)-[]->(n2:Object)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
 n1 | n2 
----+----
(0 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1)-[]->(n2)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[]->(n2:Object)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
 n1 | n2 
----+----
(0 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1393', $$
  CREATE (n1:Object)-[e:knows]->(n2:Object) RETURN n1, e, n2
$$) AS (n1 agtype, e agtype, n2 agtype);
                                  n1                                  |                                                             e                                                              |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1)-[]->(n2)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1:Object)-[]->(n2:Object)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1)-[]->(n2)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(8 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[]->(n2:Object)) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(8 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(3 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(6 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1:Object)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(3 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
                                  n1                                  |                                  n2                                  
----------------------------------------------------------------------+----------------------------------------------------------------------
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131969, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131969, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
 {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex
(6 rows)

-- should error
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1:object)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
ERROR:  multiple labels for variable 'n1' are not supported
LINE 2: ...MATCH (n1:Object) MATCH (n2:Object) WHERE EXISTS((n1:object)...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1:object)-[]->()) RETURN n1,n2
$$) AS (n1 agtype, n2 agtype);
ERROR:  multiple labels for variable 'n1' are not supported
LINE 2: ...H (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1:object)...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1)-[e]->()) RETURN n1,n2,e
$$) AS (n1 agtype, n2 agtype, e agtype);
ERROR:  variable `e` does not exist
LINE 2: ...1:Object) MATCH (n2:Object) WHERE NOT EXISTS((n1)-[e]->()) R...
                                                             ^
-- edge cases
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((n1)-[e1]->(n2)) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((n1:Object)-[e1:knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1)-[e1]->(n2)) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[e1:knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(2 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((n1)-[e1]->()) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(3 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((n1:Object)-[e1:knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1)-[e1]->()) RETURN e1
$$) AS (e1 agtype);
 e1 
----
(0 rows)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[e1:knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
                                                             e1                                                             
----------------------------------------------------------------------------------------------------------------------------
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
 {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(2 rows)

-- should error
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((n1:Object)-[e1:Knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
ERROR:  multiple labels for variable 'e1' are not supported
LINE 2: ...s]->() MATCH (n2:Object) WHERE EXISTS((n1:Object)-[e1:Knows]...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[e1:Knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
ERROR:  multiple labels for variable 'e1' are not supported
LINE 2: ...() MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[e1:Knows]...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((e1:Object)-[e1:Knows]->(n2:Object)) RETURN e1
$$) AS (e1 agtype);
ERROR:  variable 'e1' is for an edge
LINE 2: ...t)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((e1:Object)...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[e1:knows]->(e1)) RETURN e1
$$) AS (e1 agtype);
ERROR:  variable 'e1' is for an edge
LINE 2: ...Object) WHERE NOT EXISTS((n1:Object)-[e1:knows]->(e1)) RETUR...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE NOT EXISTS((n1:Object)-[e1:knows]->(e2)) RETURN e1
$$) AS (e1 agtype);
ERROR:  variable `e2` does not exist
LINE 2: ...Object) WHERE NOT EXISTS((n1:Object)-[e1:knows]->(e2)) RETUR...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH p=(n1:Object)-[e1:knows]->() MATCH (n2:Object) WHERE EXISTS((n1:Object)-[p]->(e2)) RETURN e1
$$) AS (e1 agtype);
ERROR:  variable 'p' is for a path
LINE 2: ...s]->() MATCH (n2:Object) WHERE EXISTS((n1:Object)-[p]->(e2))...
                                                             ^
SELECT * FROM cypher('issue_1393', $$
  MATCH p=(n1)-[e1]->() MATCH (n2) WHERE EXISTS((n1)-[p]->(e2)) RETURN p
$$) AS (e1 agtype);
ERROR:  variable 'p' is for a path
LINE 2: ...ATCH p=(n1)-[e1]->() MATCH (n2) WHERE EXISTS((n1)-[p]->(e2))...
                                                             ^
-- long cases
SELECT * FROM cypher('issue_1393', $$
  MATCH (n1) MATCH (n2) MATCH (n1)-[e1]->() MATCH (n2)<-[e2]-(n1) MATCH (n3)
  WHERE EXISTS((n3)-[e1]->(n2)) RETURN n1,n2,n3,e1
$$) AS (n1 agtype, n2 agtype, n3 agtype, e1 agtype);
                                  n1                                  |                                  n2                                  |                                  n3                                  |                                                             e1                                                             
----------------------------------------------------------------------+----------------------------------------------------------------------+----------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(1 row)

SELECT * FROM cypher('issue_1393', $$
  MATCH (n1:Object) MATCH (n2:Object) MATCH (n1)-[e1:knows]->() MATCH (n2)<-[e2:knows]-(n1) MATCH (n3:Object)
  WHERE EXISTS((n3:Object)-[e1:knows]->(n2:Object)) RETURN n1,n2,n3,e1
$$) AS (n1 agtype, n2 agtype, n3 agtype, e1 agtype);
                                  n1                                  |                                  n2                                  |                                  n3                                  |                                                             e1                                                             
----------------------------------------------------------------------+----------------------------------------------------------------------+----------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------
 {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 844424930131971, "label": "Object", "properties": {}}::vertex | {"id": 844424930131970, "label": "Object", "properties": {}}::vertex | {"id": 1125899906842625, "label": "knows", "end_id": 844424930131971, "start_id": 844424930131970, "properties": {}}::edge
(1 row)

--
-- Clean up
--
SELECT drop_graph('cypher_match', true);
NOTICE:  drop cascades to 17 other objects
DETAIL:  drop cascades to table cypher_match._ag_label_vertex
drop cascades to table cypher_match._ag_label_edge
drop cascades to table cypher_match.v
drop cascades to table cypher_match.v1
drop cascades to table cypher_match.e1
drop cascades to table cypher_match.v2
drop cascades to table cypher_match.e2
drop cascades to table cypher_match.v3
drop cascades to table cypher_match.e3
drop cascades to table cypher_match.loop
drop cascades to table cypher_match.self
drop cascades to table cypher_match.duplicate
drop cascades to table cypher_match.dup_edge
drop cascades to table cypher_match.other_v
drop cascades to table cypher_match.opt_match_v
drop cascades to table cypher_match.opt_match_e
drop cascades to table cypher_match.knows
NOTICE:  graph "cypher_match" has been dropped
 drop_graph 
------------
 
(1 row)

SELECT drop_graph('test_retrieve_var', true);
NOTICE:  drop cascades to 5 other objects
DETAIL:  drop cascades to table test_retrieve_var._ag_label_vertex
drop cascades to table test_retrieve_var._ag_label_edge
drop cascades to table test_retrieve_var."A"
drop cascades to table test_retrieve_var.incs
drop cascades to table test_retrieve_var."C"
NOTICE:  graph "test_retrieve_var" has been dropped
 drop_graph 
------------
 
(1 row)

SELECT drop_graph('test_enable_containment', true);
NOTICE:  drop cascades to 3 other objects
DETAIL:  drop cascades to table test_enable_containment._ag_label_vertex
drop cascades to table test_enable_containment._ag_label_edge
drop cascades to table test_enable_containment."Customer"
NOTICE:  graph "test_enable_containment" has been dropped
 drop_graph 
------------
 
(1 row)

SELECT drop_graph('issue_945', true);
NOTICE:  drop cascades to 3 other objects
DETAIL:  drop cascades to table issue_945._ag_label_vertex
drop cascades to table issue_945._ag_label_edge
drop cascades to table issue_945."Part"
NOTICE:  graph "issue_945" has been dropped
 drop_graph 
------------
 
(1 row)

SELECT drop_graph('issue_1399', true);
NOTICE:  drop cascades to 3 other objects
DETAIL:  drop cascades to table issue_1399._ag_label_vertex
drop cascades to table issue_1399._ag_label_edge
drop cascades to table issue_1399."BAR"
NOTICE:  graph "issue_1399" has been dropped
 drop_graph 
------------
 
(1 row)

SELECT drop_graph('issue_1393', true);
NOTICE:  drop cascades to 4 other objects
DETAIL:  drop cascades to table issue_1393._ag_label_vertex
drop cascades to table issue_1393._ag_label_edge
drop cascades to table issue_1393."Object"
drop cascades to table issue_1393.knows
NOTICE:  graph "issue_1393" has been dropped
 drop_graph 
------------
 
(1 row)

--
-- End
--