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 TRIGGER Library_trigger
  INSTEAD OF
  INSERT ON Library_view
  FOR EACH ROW
DECLARE
  Bookvar  Book_t;
  i        INTEGER;
BEGIN
  INSERT INTO Library_table
  VALUES (:NEW.Section);
 
  FOR i IN 1..:NEW.Booklist.COUNT LOOP
    Bookvar := :NEW.Booklist(i);
 
    INSERT INTO Book_table (
      Booknum, Section, Title, Author, Available      
    )
    VALUES (
      Bookvar.booknum, :NEW.Section, Bookvar.Title,
      Bookvar.Author, bookvar.Available
    );
  END LOOP;
END;

CREATE OR REPLACE TRIGGER Tbl_Trg
  AFTER UPDATE ON tbl
  FOR EACH ROW
BEGIN
  INSERT INTO tbl_history (d, old_obj, new_obj)
  VALUES (SYSDATE, :OLD.OBJECT_VALUE, :NEW.OBJECT_VALUE);
END Tbl_Trg;

CREATE OR REPLACE PACKAGE pkg IS
  n NUMBER := 5;
END pkg;

CREATE OR REPLACE TRIGGER Contacts_Rvrs_Xed
  BEFORE INSERT OR UPDATE ON Contacts_Table
  FOR EACH ROW
  REVERSE CROSSEDITION
  DISABLE
BEGIN
  :NEW.Name_1 := :NEW.Last_Name_2||', '||:NEW.First_Name_2;
  :NEW.Phone_Number_1 :=
  CASE :New.Country_Code_2
    WHEN '+1' THEN
      REPLACE(:NEW.Phone_Number_2, '-', '.')
    ELSE
      '011.'||LTRIM(:NEW.Country_Code_2, '+')||'.'||
      REPLACE(:NEW.Phone_Number_2, '-', '.')
  END;
END Contacts_Rvrs_Xed;

CREATE OR REPLACE TRIGGER set_empno_ctx_trig AFTER LOGON ON DATABASE
 BEGIN
  sec_mgr.set_empno_ctx_proc;
 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