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  1. MariaDB Server
  2. MDEV-7147

CASE returns unexpected result with a YEAR(2) field

        Details

        • Type: Bug
        • Status: Open
        • Priority: Minor
        • Resolution: Unresolved
        • Affects Version/s: 10.0.14, 10.1.1
        • Fix Version/s: 10.1
        • Component/s: None
        • Labels:
          None

          Description

          DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a YEAR(2));
INSERT INTO t1 VALUES (0);
SELECT a,NULLIF(a,2000),CASE a WHEN 2000 THEN NULL ELSE 2000 END FROM t1;

          returns

          +------+----------------+------------------------------------------+
| a    | NULLIF(a,2000) | CASE a WHEN 2000 THEN NULL ELSE 2000 END |
+------+----------------+------------------------------------------+
|   00 |           NULL |                                     2000 |
+------+----------------+------------------------------------------+

          The result for CASE looks wrong. It should return NULL, similar to what NULLIF does.

          Note, if I slightly rewrite CASE, it works fine:

          mysql> SELECT CASE WHEN a=2000 THEN NULL ELSE 2000 END FROM t1;
+------------------------------------------+
| CASE WHEN a=2000 THEN NULL ELSE 2000 END |
+------------------------------------------+
|                                     NULL |
+------------------------------------------+

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                  • Assignee:
                    bar Alexander Barkov
                    Reporter:
                    bar Alexander Barkov
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                    Dates

                    • Created:
                      Updated: