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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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11
mysql-test/main/range.result
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@ -3244,6 +3244,17 @@ SELECT * FROM t1 JOIN t2 ON (t2.code = t1.b) WHERE t1.a NOT IN ('baz', 'qux') OR
id a b code num
DROP TABLE t1, t2;
#
# MDEV-23634: Select query hanged the server and leads to OOM ...
# (The fix is to add the same handling for "col!=const" as MDEV-21958 did for NOT IN)
#
create table t1 (pk int primary key, a int);
insert into t1 (pk) values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
# must not use range:
explain select * from t1 force index (primary) where pk != 1 and pk!=2 ;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 10 Using where
drop table t1;
#
# MDEV-22251: get_key_scans_params: Conditional jump or move depends on uninitialised value
#
create table t1 (pk int, i int, v int, primary key (pk), key(v));