Support parsing Oracle CREATE OR 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 OR REPLACE VIEW hr_po_tab OF XMLType 
  ELEMENT "PurchaseOrder" WITH OBJECT ID DEFAULT AS
  SELECT XMLtransform(OBJECT_VALUE, x.col1)
    FROM purchaseorder p, xsl_tab x;

CREATE OR REPLACE VIEW time_c AS
(SELECT * FROM edge_time
UNION ALL
SELECT '2001-13_2', 2001, 5, '2001-05', 13, '2001-13', null, null,
8 -- <gid_of_mon>
FROM DUAL);

CREATE OR REPLACE VIEW v1 AS
  SELECT *
    FROM employees
    WHERE employee_id < 150;

CREATE OR REPLACE VIEW v2 AS
  SELECT v1.employee_id employee_id, departments.department_id department_id
    FROM v1, departments
    WHERE v1.department_id = departments.department_id;

SELECT /*+ NO_MERGE(v2) INDEX(v2.v1.employees emp_emp_id_pk)
                        FULL(v2.departments) */ *
  FROM v2
  WHERE department_id = 30;

CREATE OR REPLACE VIEW v_emp_job_history AS
  SELECT e1.first_name, e1.last_name, j.job_id, sum(e2.salary) total_sal
  FROM   employees e1, (SELECT * FROM employees e3) e2, job_history j
  WHERE  e1.employee_id = e2.manager_id
  AND    e1.employee_id = j.employee_id
  AND    e1.hire_date = j.start_date
  AND    e1.salary = ( SELECT max(e2.salary) 
                       FROM employees e2 
                       WHERE e2.department_id = e1.department_id ) 
  GROUP BY e1.first_name, e1.last_name, j.job_id
  ORDER BY total_sal;

CREATE OR REPLACE view v_orders AS
SELECT l.product_id, SUM(l.quantity*unit_price) revenue, 
       o.order_id, o.customer_id
  FROM orders o, order_items l
 WHERE o.order_id = l.order_id
 GROUP BY l.product_id, o.order_id, o.customer_id;

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[bot]]

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[bot]]

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