FlyingZC opened a new issue, #27165:
URL: https://github.com/apache/shardingsphere/issues/27165

   # 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;
   ALTER SESSION SET NLS_DATE_FORMAT='DD-MON-YYYY';
   
   DECLARE
     record_value VARCHAR2(4000);
   BEGIN
     get_recent_record('Andy', 'Waiter', record_value);
   END;
   ```
   
   ```sql
   SET SERVEROUTPUT ON;
   UPDATE tab1 SET c1 = '<h1>Different Document Fragment</h1><p>Different 
text.';
   
   SELECT * FROM tab1;
   ```
   
   ```sql
   SET SERVEROUTPUT ON;
   DECLARE
     record_value VARCHAR2(4000);
   BEGIN
     get_record_2('Andy', 'Waiter', record_value);
   END;
   ```
   
   ```sql
   SET SQLPROMPT '_CONNECT_IDENTIFIER> '
   ```
   
   ```sql
   SHOW RECYCLEBIN;
   ```
   
   # 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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