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Adjust costs for rowid filter

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- Use log2() insted of log()
- Added missing ''+' when calculating rowid setup cost
- Adjusted ROWID_FILTER_PER_ELEMENT_MODIFIER (from 3 to 1)

Other things:
- Adjusted cost for index_merge where rows_out < 1.0

The effects of the changes:
- rowid filter will have higher setup cost
- rowid filter will have slightly less costs per row

This can be seen in mtr where some tests, with 'small tables or
that uses rowid filters with many rows, will not use rowid filter anymore.
This commit is contained in:
Monty
2023-02-12 14:53:47 +02:00
committed by Sergei Petrunia
parent 9c401c8c39
commit 3c1b7fb03e
33 changed files with 438 additions and 748 deletions
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4
mysql-test/main/selectivity_innodb.result
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@ -1899,7 +1899,7 @@ WHERE A.a=t1.a AND t2.b < 20);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 100 Using where; Using index
2 DEPENDENT SUBQUERY A ref PRIMARY,a a 5 test.t1.a 1 Using index
2 DEPENDENT SUBQUERY t2 ref|filter a,b a|b 5|5 test.A.id 1 (19%) Using where; Using rowid filter
2 DEPENDENT SUBQUERY t2 ref a,b a 5 test.A.id 1 Using where
EXPLAIN SELECT * FROM t1 A, t1 B WHERE A.a = B.a and A.id = 65;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE A const PRIMARY,a PRIMARY 4 const 1
@ -1911,7 +1911,7 @@ WHERE A.a=t1.a AND t2.b < 20);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 100 Using where; Using index
2 DEPENDENT SUBQUERY A ref PRIMARY,a a 5 test.t1.a 1 Using index
2 DEPENDENT SUBQUERY t2 ref|filter a,b a|b 5|5 test.A.id 1 (19%) Using where; Using rowid filter
2 DEPENDENT SUBQUERY t2 ref a,b a 5 test.A.id 1 Using where
set optimizer_switch= @save_optimizer_switch;
set optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
drop table t1,t2;