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  1. MariaDB Server
  2. MDEV-37740

LOCATE(X,Y,NULL) is not NULL

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      Hi,

      Based on the document https://mariadb.com/docs/server/reference/sql-functions/string-functions/locate, if any argument of LOCATE is NULL, LOCATE returns NULL.

      However, it returns 0 in the following test case:

      CREATE TABLE t0(c0 REAL);
      		 
      CREATE TABLE IF NOT EXISTS t1 LIKE t0;
      		 
      INSERT INTO t0 VALUES (-1);
      		 
      SELECT t1.c0, LOCATE(t0.c0, t0.c0, t1.c0) FROM t0 LEFT JOIN t1 ON false;


      c0      LOCATE(t0.c0, t0.c0, t1.c0)
      		 
      NULL    0

      I tried this in MySQL and found it returns NULL.

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            serg Sergei Golubchik
            ChiZhang Chi Zhang
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