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MWL#17: Table elimination

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mysql-test/r/table_elim.result:
  MWL#17: Table elimination
  - More tests
mysql-test/t/table_elim.test:
  MWL#17: Table elimination
  - More tests
sql/opt_table_elimination.cc:
  MWL#17: Table elimination
  - Code cleanup
sql/sql_select.cc:
  MWL#17: Table elimination
  - Code cleanup
sql/sql_select.h:
  MWL#17: Table elimination
  - Code cleanup
sql/table.h:
  MWL#17: Table elimination
  - Code cleanup
This commit is contained in:
Sergey Petrunya
2009-06-29 17:51:15 +04:00
parent d764108a2c
commit 9fa1bce436
6 changed files with 277 additions and 218 deletions
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30
mysql-test/r/table_elim.result
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@ -172,3 +172,33 @@ Note 1276 Field or reference 'test.F.id' of SELECT #3 was resolved in SELECT #1
Note 1003 select `F`.`id` AS `id` from `test`.`t0` `F` join `test`.`t2` `A2` where ((`F`.`id` = `A2`.`id`) and (`A2`.`attr2` between 12 and 14) and (`A2`.`fromdate` = (select max(`test`.`t2`.`fromdate`) AS `MAX(fromdate)` from `test`.`t2` where (`test`.`t2`.`id` = `F`.`id`))))
drop view v1, v2;
drop table t0, t1, t2;
create table t1 (a int);
insert into t1 values (0),(1),(2),(3);
create table t2 (pk1 int, pk2 int, pk3 int, col int, primary key(pk1, pk2, pk3));
insert into t2 select a,a,a,a from t1;
This must use only t1:
explain select t1.* from t1 left join t2 on t2.pk1=t1.a and
t2.pk2=t2.pk1+1 and
t2.pk3=t2.pk2+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
This must use only t1:
explain select t1.* from t1 left join t2 on t2.pk1=t1.a and
t2.pk3=t2.pk1+1 and
t2.pk2=t2.pk3+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
This must use both:
explain select t1.* from t1 left join t2 on t2.pk1=t1.a and
t2.pk3=t2.pk1+1 and
t2.pk2=t2.pk3+t2.col;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a 1
This must use only t1:
explain select t1.* from t1 left join t2 on t2.pk2=t1.a and
t2.pk1=t2.pk2+1 and
t2.pk3=t2.pk1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
drop table t1, t2;