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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/subselect_no_scache.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/subselect_no_scache.result')
| -rw-r--r-- | mysql-test/main/subselect_no_scache.result | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/mysql-test/main/subselect_no_scache.result b/mysql-test/main/subselect_no_scache.result index 977b2d0175c..e346332e377 100644 --- a/mysql-test/main/subselect_no_scache.result +++ b/mysql-test/main/subselect_no_scache.result @@ -5694,8 +5694,8 @@ EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT a FROM t2 USE INDEX() WHERE t2.a = t1.a); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 3 -1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where; Using join buffer (flat, BNL join) +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 2 MATERIALIZED t2 ALL NULL NULL NULL NULL 3 SELECT * FROM t1 WHERE EXISTS (SELECT a FROM t2 WHERE t2.a = t1.a); @@ -5705,8 +5705,8 @@ EXPLAIN SELECT * FROM t1 WHERE EXISTS (SELECT a FROM t2 WHERE t2.a = t1.a); id select_type table type possible_keys key key_len ref rows Extra -1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 3 -1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where; Using join buffer (flat, BNL join) +1 PRIMARY t1 ALL NULL NULL NULL NULL 4 +1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 2 MATERIALIZED t2 index idx idx 5 NULL 3 Using index DROP TABLE t1,t2; # |