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MDEV-27426 Wrong result upon query using index_merge with DESC key

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Make QUICK_RANGE_SELECT::cmp_next() aware of reverse-ordered key parts.

(QUICK_RANGE_SELECT::cmp_prev() uses key_cmp() and so it already works
correctly)
This commit is contained in:
Sergei Petrunia
2022-01-10 16:19:03 +03:00
committed by Sergei Golubchik
parent 96bdda6c96
commit 62760af4df
3 changed files with 25 additions and 4 deletions
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10
mysql-test/main/desc_index_range.test
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@@ -86,3 +86,13 @@ from information_schema.optimizer_trace;
drop table t1;
set optimizer_trace=default;
--echo #
--echo # MDEV-27426: Wrong result upon query using index_merge with DESC key
--echo #
CREATE OR REPLACE TABLE t1 (pk INT, a INT, b int, KEY(a), PRIMARY KEY(pk DESC)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,4,5),(2,9,6),(3,NULL,7),(4,NULL,8);
SELECT * FROM t1 WHERE pk > 10 OR a > 0;
DROP TABLE t1;