[MDEV-13273] Confusion between table alias and ROW type variable - Jira

This script:

SET sql_mode=DEFAULT;

CREATE OR REPLACE TABLE t1 (c1 INT, c2 INT);

INSERT INTO t1 VALUES (0,0);

DELIMITER $$

DROP PROCEDURE IF EXISTS p1;

CREATE PROCEDURE p1()

BEGIN

  DECLARE a INT;

  DECLARE b INT;

  SELECT a.c1 INTO b

    FROM t1 a

   WHERE a.c2 = 0;

END;

$$

DELIMITER ;

CALL p1;

works fine in 10.2. It treats a.c2 as a reference to the column a.c2, which is in fact t1.c2.

Starting from bb-10.2-ext and 10.3, the same script fails to create the procedure with this error:

ERROR 1105 (HY000): 'a' is not a row variable