Details
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Bug
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Status: Open (View Workflow)
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Minor
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Resolution: Unresolved
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10.2, 10.3, 10.4, 10.5, 10.6
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None
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None
Description
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a YEAR(2));
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INSERT INTO t1 VALUES (0);
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SELECT a,NULLIF(a,2000),CASE a WHEN 2000 THEN NULL ELSE 2000 END FROM t1;
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returns
+------+----------------+------------------------------------------+
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| a | NULLIF(a,2000) | CASE a WHEN 2000 THEN NULL ELSE 2000 END |
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+------+----------------+------------------------------------------+
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| 00 | NULL | 2000 |
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+------+----------------+------------------------------------------+
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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;
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+------------------------------------------+
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| CASE WHEN a=2000 THEN NULL ELSE 2000 END |
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+------------------------------------------+
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| NULL |
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+------------------------------------------+
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