[GitHub] [shardingsphere] FlyingZC opened a new issue, #27057: Support parsing Oracle CREATE OR sql

["FlyingZC (via GitHub)" <gi...@apache.org>]

FlyingZC opened a new issue, #27057:
URL: https://github.com/apache/shardingsphere/issues/27057

   # 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:
   ```sql
   CREATE OR REPLACE FUNCTION factorial (
     n POSITIVE
   ) RETURN POSITIVE
   IS
   BEGIN
     IF n = 1 THEN                 -- terminating condition
       RETURN n;
     ELSE
       RETURN n * factorial(n-1);  -- recursive invocation
     END IF;
   END;
   ```
   
   ```sql
   CREATE OR REPLACE FUNCTION getXML(pathname VARCHAR2, charset VARCHAR2) 
     RETURN BLOB IS
     xblob BLOB;
   BEGIN
     SELECT XMLSERIALIZE(DOCUMENT e.RES AS BLOB ENCODING charset) INTO xblob
       FROM RESOURCE_VIEW e WHERE equals_path(e.RES, pathname) = 1;
     RETURN xblob;
   END;
   ```
   
   ```sql
   CREATE OR REPLACE FUNCTION fibonacci (n NUMBER)
      RETURN NUMBER RESULT_CACHE IS
   BEGIN
     IF (n =0) OR (n =1) THEN
       RETURN 1;
     ELSE
       RETURN fibonacci(n - 1) + fibonacci(n - 2);
     END IF;
   END;
   ```
   
   ```sql
   CREATE OR REPLACE FUNCTION get_hire_date
     (emp_id NUMBER, fmt VARCHAR) RETURN VARCHAR
     RESULT_CACHE
   IS
     date_hired DATE;
   BEGIN
     SELECT hire_date INTO date_hired
       FROM HR.EMPLOYEES
         WHERE EMPLOYEE_ID = emp_id;
     RETURN TO_CHAR(date_hired, fmt);
   END;
   ```
   
   ```sql
   CREATE OR REPLACE FUNCTION get_hire_date (emp_id NUMBER) RETURN VARCHAR
    RESULT_CACHE
   IS
     date_hired DATE;
   BEGIN
     SELECT hire_date INTO date_hired
       FROM HR.EMPLOYEES
         WHERE EMPLOYEE_ID = emp_id;
     RETURN TO_CHAR(date_hired);
   END;
   ```
   
   # 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


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[GitHub] [shardingsphere] FlyingZC closed issue #27057: Support parsing Oracle CREATE OR sql

["FlyingZC (via GitHub)" <gi...@apache.org>]

FlyingZC closed issue #27057: Support parsing Oracle CREATE OR sql
URL: https://github.com/apache/shardingsphere/issues/27057


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