Syntax
------

SHOW PROCEDURE CODE proc_name

Description
-----------

This statement is a MariaDB extension that is available only for servers that
have been built with debugging support. It displays a representation of the
internal implementation of the named stored procedure. A similar statement,
SHOW FUNCTION CODE, displays information about stored functions.

Both statements require that you be the owner of the routine or have SELECT
access to the mysql.proc table.

If the named routine is available, each statement produces a result set. Each
row in the result set corresponds to one "instruction" in the routine. The
first column is Pos, which is an ordinal number beginning with 0. The second
column is Instruction, which contains an SQL statement (usually changed from
the original source), or a directive which has meaning only to the
stored-routine handler.

Examples
--------

DELIMITER //

CREATE PROCEDURE p1 ()
 BEGIN
  DECLARE fanta INT DEFAULT 55;
  DROP TABLE t2;
  LOOP
   INSERT INTO t3 VALUES (fanta);
   END LOOP;
 END//
Query OK, 0 rows affected (0.00 sec)

SHOW PROCEDURE CODE p1//
+-----+----------------------------------------+
| Pos | Instruction                            |
+-----+----------------------------------------+
|   0 | set fanta@0 55                         |
|   1 | stmt 9 "DROP TABLE t2"                 |
|   2 | stmt 5 "INSERT INTO t3 VALUES (fanta)" |
|   3 | jump 2                                 |
+-----+----------------------------------------+

URL: https://mariadb.com/kb/en/show-procedure-code/