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MDEV-23634: Select query hanged the server and leads to OOM ...

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Handle "col<>const" in the same way that MDEV-21958 did for
"col NOT IN(const-list)": do not use the condition for range/index_merge
accesses if there is a unique UNIQUE KEY(col).

The testcase is in main/range.test. The rest of test updates are
due to widespread use of 'pk<>1' in the testsuite. Changed the test
to use different but equivalent forms of the conditions.
This commit is contained in:
Sergei Petrunia
2021-04-08 17:25:02 +03:00
parent 4e2ca42225
commit c03841ec0e
21 changed files with 142 additions and 74 deletions
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12
mysql-test/include/icp_tests.inc
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@ -484,11 +484,11 @@ CREATE TABLE t1 (
INSERT INTO t1 VALUES (1,9),(2,7),(3,6),(4,3),(5,1);
EXPLAIN SELECT pk, c1 FROM t1 WHERE pk <> 3;
EXPLAIN SELECT pk, c1 FROM t1 WHERE (pk<3 or pk>3);
SET SESSION optimizer_switch='index_condition_pushdown=off';
SELECT pk, c1 FROM t1 WHERE pk <> 3;
SELECT pk, c1 FROM t1 WHERE (pk<3 or pk>3);
DROP TABLE t1;
@ -727,16 +727,16 @@ INSERT INTO t2 VALUES
SET SESSION optimizer_switch='index_condition_pushdown=off';
EXPLAIN
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND t1.b != 0
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND (t1.b<0 OR t1.b>0)
HAVING t1.c != 5 ORDER BY t1.c;
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND t1.b != 0
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND (t1.b<0 OR t1.b>0)
HAVING t1.c != 5 ORDER BY t1.c;
SET SESSION optimizer_switch='index_condition_pushdown=on';
EXPLAIN
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND t1.b != 0
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND (t1.b<0 OR t1.b>0)
HAVING t1.c != 5 ORDER BY t1.c;
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND t1.b != 0
SELECT t1.b, t1.c FROM t1, t2 WHERE t1.a = t2.a AND (t1.b<0 OR t1.b>0)
HAVING t1.c != 5 ORDER BY t1.c;
DROP TABLE t1,t2;