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MDEV-17411 Wrong WHERE optimization with simple CASE and searched CASE

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This commit is contained in:
Alexander Barkov
2018-10-11 13:39:53 +04:00
parent 30629e196d
commit 4de0d920be
7 changed files with 66 additions and 9 deletions
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22
mysql-test/main/case.test
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@ -390,6 +390,28 @@ EXPLAIN EXTENDED SELECT * FROM t1 WHERE a='a' AND CASE 'a' WHEN 'a' THEN 'a' ELS
DROP TABLE t1;
--echo #
--echo # MDEV-17411 Wrong WHERE optimization with simple CASE and searched CASE
--echo #
CREATE TABLE t1 (a INT, b INT, KEY(a));
INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
SELECT * FROM t1 WHERE CASE a WHEN b THEN 1 END=1;
SELECT * FROM t1 WHERE CASE WHEN a THEN b ELSE 1 END=3;
SELECT * FROM t1 WHERE
CASE a WHEN b THEN 1 END=1 AND
CASE WHEN a THEN b ELSE 1 END=3;
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE
CASE a WHEN b THEN 1 END=1 AND
CASE WHEN a THEN b ELSE 1 END=3;
DROP TABLE t1;
--echo #
--echo # End of 10.3 test
--echo #