| commit | 8e721bbc39decc732ffdd3b32201ed3b0207e958 | [log] [tgz] |
|---|---|---|
| author | Dehowe Feng <8065116+dehowef@users.noreply.github.com> | Fri Apr 26 03:26:01 2024 +0800 |
| committer | GitHub <noreply@github.com> | Thu Apr 25 12:26:01 2024 -0700 |
| tree | 314f554d1ee7a68ab948b029b75620d63e89687e | |
| parent | 034e07912ff0e56ac9cba6b81e9df0b9ae8036cc [diff] |
Implement Constraints on Subqueries (#1751) * Implement COUNT Subquery with PG specifications Implements a version of COUNT subquery that evaluates the underlying subquery according to Postgres subquery specifications. Modifies the grammar to accept all valid input for both COUNT and EXISTS subqueries. Add regression tests related to COUNT Modify the subquery regression tests to accomodate changes introduced in this update. * Implement Constraints on Subqueries Added logic to support constraints on subqueries. Added an expression tree walker to traverse expr trees. This logic can be expanded to search expr trees for other exprs outside of subqueries as well. Changed OPTIONAL MATCH logic to accomodate for subqueries. Changed the grammar for COUNT () functions to use a keyword. This avoids grammatical errors with other components. Add regression tests for subqueries as well as some for the expr tree walker. Reformatted previous regression tests.
Apache AGE is an extension for PostgreSQL that enables users to leverage a graph database on top of the existing relational databases. AGE is an acronym for A Graph Extension and is inspired by Bitnine's AgensGraph, a multi-model database fork of PostgreSQL. The basic principle of the project is to create a single storage that handles both the relational and graph data model so that the users can use the standard ANSI SQL along with openCypher, one of the most popular graph query languages today. There is a strong need for cohesive, easy-to-implement multi-model databases. As an extension of PostgreSQL, AGE supports all the functionalities and features of PostgreSQL while also offering a graph model to boot.
Apache AGE is :
Refer to our latest Apache AGE documentation to learn about installation, features, built-in functions, and Cypher queries.
Install the following essential libraries according to each OS. Building AGE from the source depends on the following Linux libraries (Ubuntu package names shown below):
yum install gcc glibc glib-common readline readline-devel zlib zlib-devel flex bison
dnf install gcc glibc bison flex readline readline-devel zlib zlib-devel
sudo apt-get install build-essential libreadline-dev zlib1g-dev flex bison
Apache AGE is intended to be simple to install and run. It can be installed with Docker and other traditional ways.
You will need to install an AGE compatible version of Postgres, for now AGE supports Postgres 11, 12, 13, 14, 15 & 16. Supporting the latest versions is on AGE roadmap.
You can use a package management that your OS provides to download AGE.
sudo apt install postgresql
You can download the Postgres source code and install your own instance of Postgres. You can read instructions on how to install from source code for different versions on the official Postgres Website.
Clone the github repository or download the download an official release. Run the pg_config utility and check the version of PostgreSQL. Currently, only PostgreSQL versions 11, 12, 13, 14, 15 & 16 are supported. If you have any other version of Postgres, you will need to install PostgreSQL version 11, 12, 13, 14, 15, or 16.
pg_config
Run the following command in the source code directory of Apache AGE to build and install the extension.
make install
If the path to your Postgres installation is not in the PATH variable, add the path in the arguments:
make PG_CONFIG=/path/to/postgres/bin/pg_config install
docker pull apache/age
docker run \ --name age \ -p 5455:5432 \ -e POSTGRES_USER=postgresUser \ -e POSTGRES_PASSWORD=postgresPW \ -e POSTGRES_DB=postgresDB \ -d \ apache/age
docker exec -it age psql -d postgresDB -U postgresUser
For every connection of AGE you start, you will need to load the AGE extension.
CREATE EXTENSION age;
LOAD 'age';
SET search_path = ag_catalog, "$user", public;
To create a graph, use the create_graph function located in the ag_catalog namespace.
SELECT create_graph('graph_name');
To create a single vertex with label and properties, use the CREATE clause.
SELECT * FROM cypher('graph_name', $$ CREATE (:label {property:"Node A"}) $$) as (v agtype);
SELECT * FROM cypher('graph_name', $$ CREATE (:label {property:"Node B"}) $$) as (v agtype);
To create an edge between two nodes and set its properties:
SELECT * FROM cypher('graph_name', $$ MATCH (a:label), (b:label) WHERE a.property = 'Node A' AND b.property = 'Node B' CREATE (a)-[e:RELTYPE {property:a.property + '<->' + b.property}]->(b) RETURN e $$) as (e agtype);
And to query the connected nodes:
SELECT * from cypher('graph_name', $$
MATCH (V)-[R]-(V2)
RETURN V,R,V2
$$) as (V agtype, R agtype, V2 agtype);
Starting with Apache AGE is very simple. You can easily select your platform and incorporate the relevant SDK into your code.
Apache AGE Viewer is a user interface for Apache AGE that provides visualization and exploration of data. This web visualization tool allows users to enter complex graph queries and explore the results in graph and table forms. Apache AGE Viewer is enhanced to proceed with extensive graph data and discover insights through various graph algorithms. Apache AGE Viewer will become a graph data administration and development platform for Apache AGE to support multiple relational databases: https://github.com/apache/age-viewer.
This is a visualization tool. After installing AGE Extension, you may use this tool to get access to the visualization features.
You can also get help from these videos.
You can improve ongoing efforts or initiate new ones by sending pull requests to this repository. Also, you can learn from the code review process, how to merge pull requests, and from code style compliance to documentation by visiting the Apache AGE official site - Developer Guidelines. Send all your comments and inquiries to the user mailing list, users@age.apache.org.