FlyingZC opened a new issue, #27161:
URL: https://github.com/apache/shardingsphere/issues/27161

   # 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
   SET SERVEROUTPUT ON;
   
   DECLARE
     record_value VARCHAR2(4000);
   BEGIN
     get_record('Andy', 'Waiter', record_value);
   END;
   ```
   
   ```sql
   SET CONSTRAINTS emp_job_nn, emp_salary_min ,
      hr.jhist_dept_fk@remote DEFERRED;
   ```
   
   ```sql
   SET CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO 'controlfile_%F';
   BACKUP AS COPY DATABASE;
   RUN
   { 
     SET CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/tmp/%F.bck'; 
     BACKUP AS BACKUPSET 
       DEVICE TYPE DISK 
       DATABASE;
   ```
   
   ```sql
   SET DBID 1625818158;
   CONFIGURE DEFAULT DEVICE TYPE TO SBT FOR DB_UNIQUE_NAME BOSTON;
   ```
   
   ```sql
   SET SQLPROMPT '_CONNECT_IDENTIFIER> '
   ```
   
   # 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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