Support parsing Oracle CREATE VIEW sql

[FlyingZC]

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:

CREATE VIEW emp_v AS
    SELECT empno, ename, deptno
        FROM emp;
CREATE VIEW emp_dept_oj1 AS
    SELECT e.*, Loc, d.dname
        FROM emp_v e, dept d
            WHERE e.deptno = d.deptno (+);

CREATE VIEW employees_50_vw AS
  SELECT employee_id, last_name, job_id, salary, commission_pct, department_id
  FROM   employees
  WHERE  department_id = 50;

CREATE VIEW hour_ago AS
  SELECT * FROM employees
    AS OF TIMESTAMP (SYSTIMESTAMP - INTERVAL '60' MINUTE);

CREATE VIEW hr_org_secure_view AS
   SELECT * FROM employees
   WHERE department_id = SYS_CONTEXT('hr_context', 'department_id');

CREATE VIEW hr_verify AS 
SELECT EMPLOYEE_ID, FIRST_NAME, LAST_NAME, EMAIL, MANAGER_ID 
FROM EMPLOYEES;

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

[github-actions]

There hasn't been any activity on this issue recently, and in order to prioritize active issues, it will be marked as stale.

[github-actions]

There hasn't been any activity on this issue recently, and in order to prioritize active issues, it will be marked as stale.

[zihaoAK47]

Hi please assign the questions to me. Thank you

[strongduanmu]

Fixed by #29075