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| author | Sergei Petrunia <psergey@askmonty.org> | 2019-08-29 15:37:49 +0300 |
|---|---|---|
| committer | Sergei Petrunia <psergey@askmonty.org> | 2019-08-30 12:02:40 +0300 |
| commit | ef76f81c982bdbcfa4797ce26224db9c016ddebd (patch) | |
| tree | 2f65a45620e011e24ddd4fd80d2eae35a28c4f7a /mysql-test/main/group_by.result | |
| parent | d58437d1956b2fd92197beac2e9c869ef968eba7 (diff) | |
| download | mariadb-git-ef76f81c982bdbcfa4797ce26224db9c016ddebd.tar.gz | |
MDEV-20109: Optimizer ignores distinct key created for materialized...
(Backported to 10.3, addressed review input)
Sj_materialization_picker::check_qep(): fix error in cost/fanout
calculations:
- for each join prefix, add #prefix_rows / TIME_FOR_COMPARE to the cost,
like best_extension_by_limited_search does
- Remove the fanout produced by the subquery tables.
- Also take into account join condition selectivity
optimize_wo_join_buffering() (used by LooseScan and FirstMatch)
- also add #prefix_rows / TIME_FOR_COMPARE to the cost of each prefix.
- Also take into account join condition selectivity
Diffstat (limited to 'mysql-test/main/group_by.result')
| -rw-r--r-- | mysql-test/main/group_by.result | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mysql-test/main/group_by.result b/mysql-test/main/group_by.result index a6da0e70247..807645fb2c2 100644 --- a/mysql-test/main/group_by.result +++ b/mysql-test/main/group_by.result @@ -1607,7 +1607,8 @@ EXPLAIN SELECT 1 FROM t2 WHERE a IN (SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2)); id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY t2 index a a 5 NULL 4 Using index -1 PRIMARY t1 ALL NULL NULL NULL NULL 144 Using where; FirstMatch(t2) +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 +2 MATERIALIZED t1 ALL NULL NULL NULL NULL 144 SET optimizer_switch=@save_optimizer_switch; DROP TABLE t1, t2; CREATE TABLE t1( |