Support parsing openGauss SELECT sql

[FlyingZC]

Background

Hi community,

ShardingSphere parser engine helps users parse a SQL to get the AST (Abstract Syntax Tree) and visit this tree to get SQLStatement (Java Object). Currently, we are planning to enhance the support for openGauss SQL parsing in ShardingSphere.

More details:
https://shardingsphere.apache.org/document/current/en/reference/sharding/parse/

Task

This issue is to support more openGauss sql parse, as follows:

 SELECT abbrev(cidr '10.1.0.0/16') AS RESULT;

 SELECT set_masklen('192.168.1.0/24'::cidr, 16) AS RESULT;

 SELECT text(inet '192.168.1.5') AS RESULT;

 SELECT trunc(macaddr '12:34:56:78:90:ab') AS RESULT;

 CREATE PROCEDURE insert_data  (param1 INT = 0, param2 CHAR(20),param3 CHAR(20),param4 INT = 0 ) 
IS
 BEGIN 
 INSERT INTO graderecord VALUES(param1,param2,param3,param4);  
END;
/


--调用存储过程

Process

1. First confirm that this is a correct openGauss sql syntax, if not please leave a message under the issue and ignore it;
2. Compare SQL definitions in Official SQL Doc and ShardingSphere SQL Doc;
3. If there is any difference in ShardingSphere SQL Doc, please correct them by referring to the Official SQL Doc;
4. Run mvn install the current_file_module;
5. Check whether there are any exceptions. If indeed, please fix them. (Especially xxxVisitor.class);
6. Add new corresponding SQL case in SQL Cases and expected parsed result in Expected Statement XML;
7. Run SQLParserParameterizedTest to make sure no exceptions.

Relevant Skills

1. Master JAVA language
2. Have a basic understanding of Antlr g4 file
3. Be familiar with openGauss SQLs

[github-actions]

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