# 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.

SELECT * FROM a
UNION ALL
SELECT * FROM b;
--
SetOperationStatement
+-set_operation_query=SetOperation[set_operation_type=UnionAll]
  +-children=
    +-SetOperation[set_operation_type=Select]
    | +-children=
    |   +-Select
    |     +-select_clause=SelectStar
    |     +-from_clause=
    |       +-TableReference[table=a]
    +-SetOperation[set_operation_type=Select]
      +-children=
        +-Select
          +-select_clause=SelectStar
          +-from_clause=
            +-TableReference[table=b]
==

# Currently does not support INTERSECT ALL.
SELECT * FROM a
INTERSECT ALL
SELECT * FROM b;
--
ERROR: syntax error (2 : 11)
INTERSECT ALL
          ^
==

SELECT * FROM a
UNION
SELECT * FROM b
UNION
SELECT * FROM c;
--
SetOperationStatement
+-set_operation_query=SetOperation[set_operation_type=Union]
  +-children=
    +-SetOperation[set_operation_type=Union]
    | +-children=
    |   +-SetOperation[set_operation_type=Select]
    |   | +-children=
    |   |   +-Select
    |   |     +-select_clause=SelectStar
    |   |     +-from_clause=
    |   |       +-TableReference[table=a]
    |   +-SetOperation[set_operation_type=Select]
    |     +-children=
    |       +-Select
    |         +-select_clause=SelectStar
    |         +-from_clause=
    |           +-TableReference[table=b]
    +-SetOperation[set_operation_type=Select]
      +-children=
        +-Select
          +-select_clause=SelectStar
          +-from_clause=
            +-TableReference[table=c]
==

SELECT * FROM a
INTERSECT
SELECT * FROM b
UNION
SELECT * FROM c
INTERSECT
SELECT * FROM d;
--
SetOperationStatement
+-set_operation_query=SetOperation[set_operation_type=Union]
  +-children=
    +-SetOperation[set_operation_type=Intersect]
    | +-children=
    |   +-SetOperation[set_operation_type=Select]
    |   | +-children=
    |   |   +-Select
    |   |     +-select_clause=SelectStar
    |   |     +-from_clause=
    |   |       +-TableReference[table=a]
    |   +-SetOperation[set_operation_type=Select]
    |     +-children=
    |       +-Select
    |         +-select_clause=SelectStar
    |         +-from_clause=
    |           +-TableReference[table=b]
    +-SetOperation[set_operation_type=Intersect]
      +-children=
        +-SetOperation[set_operation_type=Select]
        | +-children=
        |   +-Select
        |     +-select_clause=SelectStar
        |     +-from_clause=
        |       +-TableReference[table=c]
        +-SetOperation[set_operation_type=Select]
          +-children=
            +-Select
              +-select_clause=SelectStar
              +-from_clause=
                +-TableReference[table=d]
==

# Currently does not support using bracket to change order,
# Instead, use a subquery to change order of set operations.
SELECT * FROM a
INTERSECT
(SELECT * FROM a
UNION
SELECT * FROM b);
--
ERROR: syntax error (3 : 1)
(SELECT * FROM a
^
==

SELECT * FROM a
INTERSECT
SELECT * FROM
    (SELECT * FROM a
     UNION
     SELECT * FROM b
    ) AS temp;
--
SetOperationStatement
+-set_operation_query=SetOperation[set_operation_type=Intersect]
  +-children=
    +-SetOperation[set_operation_type=Select]
    | +-children=
    |   +-Select
    |     +-select_clause=SelectStar
    |     +-from_clause=
    |       +-TableReference[table=a]
    +-SetOperation[set_operation_type=Select]
      +-children=
        +-Select
          +-select_clause=SelectStar
          +-from_clause=
            +-SubqueryTable
              +-table_signature=TableSignature[table_alias=temp]
              +-SubqueryExpression
                +-SetOperation[set_operation_type=Union]
                  +-children=
                    +-SetOperation[set_operation_type=Select]
                    | +-children=
                    |   +-Select
                    |     +-select_clause=SelectStar
                    |     +-from_clause=
                    |       +-TableReference[table=a]
                    +-SetOperation[set_operation_type=Select]
                      +-children=
                        +-Select
                          +-select_clause=SelectStar
                          +-from_clause=
                            +-TableReference[table=b]
==

SELECT * FROM
	(SELECT * FROM a
	UNION ALL
	SELECT * FROM b
	) AS temp1
INTERSECT
SELECT * FROM
	(SELECT * FROM a
	UNION
	SELECT * FROM b
	) AS temp2;
--
SetOperationStatement
+-set_operation_query=SetOperation[set_operation_type=Intersect]
  +-children=
    +-SetOperation[set_operation_type=Select]
    | +-children=
    |   +-Select
    |     +-select_clause=SelectStar
    |     +-from_clause=
    |       +-SubqueryTable
    |         +-table_signature=TableSignature[table_alias=temp1]
    |         +-SubqueryExpression
    |           +-SetOperation[set_operation_type=UnionAll]
    |             +-children=
    |               +-SetOperation[set_operation_type=Select]
    |               | +-children=
    |               |   +-Select
    |               |     +-select_clause=SelectStar
    |               |     +-from_clause=
    |               |       +-TableReference[table=a]
    |               +-SetOperation[set_operation_type=Select]
    |                 +-children=
    |                   +-Select
    |                     +-select_clause=SelectStar
    |                     +-from_clause=
    |                       +-TableReference[table=b]
    +-SetOperation[set_operation_type=Select]
      +-children=
        +-Select
          +-select_clause=SelectStar
          +-from_clause=
            +-SubqueryTable
              +-table_signature=TableSignature[table_alias=temp2]
              +-SubqueryExpression
                +-SetOperation[set_operation_type=Union]
                  +-children=
                    +-SetOperation[set_operation_type=Select]
                    | +-children=
                    |   +-Select
                    |     +-select_clause=SelectStar
                    |     +-from_clause=
                    |       +-TableReference[table=a]
                    +-SetOperation[set_operation_type=Select]
                      +-children=
                        +-Select
                          +-select_clause=SelectStar
                          +-from_clause=
                            +-TableReference[table=b]
==