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MDEV-20109: Optimizer ignores distinct key created for materialized...

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(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
This commit is contained in:
Sergei Petrunia
2019-08-29 15:37:49 +03:00
parent d58437d195
commit ef76f81c98
27 changed files with 392 additions and 295 deletions
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24
mysql-test/suite/compat/oracle/r/table_value_constr.result
View File

@ -741,21 +741,21 @@ a b
explain extended select * from t1
where a in (values (1));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery3> ALL distinct_key NULL NULL NULL 2 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00
1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1 100.00
3 MATERIALIZED <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1)) "tvc_0") where "test"."t1"."a" = "tvc_0"."1"
Note 1003 select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1)) "tvc_0") where 1
explain extended select * from t1
where a in (select * from (values (1)) as tvc_0);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 2 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED <derived3> ALL NULL NULL NULL NULL 2 100.00
3 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 /* select#1 */ select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1)) "tvc_0") where "test"."t1"."a" = "tvc_0"."1"
Note 1003 /* select#1 */ select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1)) "tvc_0") where 1
# IN-subquery with VALUES structure(s) : UNION with VALUES on the first place
select * from t1
where a in (values (1) union select 2);
@ -976,21 +976,21 @@ a b
explain extended select * from t1
where a = any (values (1),(2));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery3> ALL distinct_key NULL NULL NULL 2 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00
1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1 100.00
3 MATERIALIZED <derived2> ALL NULL NULL NULL NULL 2 100.00
2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1),(2)) "tvc_0") where "test"."t1"."a" = "tvc_0"."1"
Note 1003 select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1),(2)) "tvc_0") where 1
explain extended select * from t1
where a = any (select * from (values (1),(2)) as tvc_0);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 2 100.00
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t1 ALL NULL NULL NULL NULL 6 100.00
1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1 100.00
2 MATERIALIZED <derived3> ALL NULL NULL NULL NULL 2 100.00
3 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 /* select#1 */ select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1),(2)) "tvc_0") where "test"."t1"."a" = "tvc_0"."1"
Note 1003 /* select#1 */ select "test"."t1"."a" AS "a","test"."t1"."b" AS "b" from "test"."t1" semi join ((values (1),(2)) "tvc_0") where 1
# ANY-subquery with VALUES structure(s) : UNION with VALUES on the first place
select * from t1
where a = any (values (1) union select 2);