Background

Hi community, This issue is for #26878.

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 Oracle SQL parsing in ShardingSphere.

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

Task

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

DROP TYPE person_typ FORCE;
DROP TABLE person_obj_table;
DROP TYPE student_typ; 
-- perform above drops if objects/tables created
CREATE OR REPLACE TYPE person_typ AS OBJECT (
  idno           NUMBER,
  name           VARCHAR2(30),
  phone          VARCHAR2(20))
  NOT FINAL;/

CREATE TABLE person_obj_table (p person_typ);

DROP TYPE student_typ VALIDATE -- incorrect: an instance still exists ;

DROP TYPE person_typ FORCE;
-- above necessary if you have previously created object

CREATE OR REPLACE TYPE person_typ AS OBJECT (
   idno           NUMBER,
   name           VARCHAR2(30),
   phone          VARCHAR2(20)) 
NOT FINAL;

DROP TYPE person_typ FORCE;
-- if created
CREATE OR REPLACE TYPE person_typ AS OBJECT (
 idno           NUMBER,
 name           VARCHAR2(30),
 phone          VARCHAR2(20),
 MAP MEMBER FUNCTION get_idno RETURN NUMBER,
 MEMBER FUNCTION show RETURN VARCHAR2)
 NOT FINAL;

ENABLE NOVALIDATE CONSTRAINT pk_time;

Process

1. First confirm that this is a correct oracle sql syntax, if not please ignore;
2. Compare SQL definitions in Oficial 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 Statment 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 Oracle SQLs