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  1. MariaDB Server
  2. MDEV-12916

Wrong column data type for an INT field of a cursor-anchored ROW variable

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      SET sql_mode=DEFAULT;
      DROP PROCEDURE IF EXISTS p1;
      DROP TABLE IF EXISTS t1,t2;
      DELIMITER $$
      CREATE PROCEDURE p1()
      BEGIN
        DECLARE a INT DEFAULT 10;
        DECLARE cur1 CURSOR FOR SELECT a;
        BEGIN
          DECLARE rec1 ROW TYPE OF cur1;
          CREATE TABLE t2 AS SELECT rec1.a;
          SHOW CREATE TABLE t2;
          DROP TABLE t2;
        END;
      END;
      $$
      DELIMITER ;
      CALL p1();
      

      +-------+-----------------------------------------------------------------------------------------------+
      | Table | Create Table                                                                                  |
      +-------+-----------------------------------------------------------------------------------------------+
      | t2    | CREATE TABLE `t2` (
        `rec1.a` bigint(20) DEFAULT NULL
      ) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
      +-------+-----------------------------------------------------------------------------------------------+
      

      Notice, it created a BIGINT(20) column. Looks wrong. The expected type is INT(11)), as in the declaration of the procedure variable a.

      The problem happens at the cursor materialization time, when create_tmp_field_from_item() is called.
      It calls Item::create_tmp_field(), which erroneously makes a BIGINT field for Item_splocal with INT data and max_length=11.

      The execution path should not go through Item::create_tmp_field() to avoid conversion from INT(11) to BIGINT(11).

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              Assignee:
              bar Alexander Barkov
              Reporter:
              bar Alexander Barkov
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                Created:
                Updated:
                Resolved: