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Merge 5.3->5.5.

Browse source 
In particular:
Merged the patch for bug mdev-4418 from 5.3 into 5.5.
Fixed a bug in the patch that should be backported to 5.3.
This commit is contained in:
Igor Babaev 2013-08-18 19:58:51 -07:00
commit 4eddb2c221
26 changed files with 807 additions and 196 deletions
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6
mysql-test/r/table_elim.result
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@ -17,7 +17,7 @@ explain extended select t1.a from t1 left join t2 on t2.a=t1.a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 100.00
Warnings:
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1` where 1
Note 1003 select `test`.`t1`.`a` AS `a` from `test`.`t1`
select t1.a from t1 left join t2 on t2.a=t1.a;
a
0
@ -62,7 +62,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 ALL NULL NULL NULL NULL 4 100.00
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 100.00 Using where
Warnings:
Note 1003 select `test`.`t0`.`a` AS `a` from `test`.`t0` left join (`test`.`t1`) on((`test`.`t1`.`a` = `test`.`t0`.`a`)) where 1
Note 1003 select `test`.`t0`.`a` AS `a` from `test`.`t0` left join (`test`.`t1`) on((`test`.`t1`.`a` = `test`.`t0`.`a`))
# Elimination with aggregate functions
explain select count(*) from t1 left join t2 on t2.a=t1.a;
id select_type table type possible_keys key key_len ref rows Extra
@ -626,6 +626,6 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 index NULL b 5 NULL 2 100.00 Using where; Using index
2 DEPENDENT SUBQUERY t1 system NULL NULL NULL NULL 1 100.00
Warnings:
Note 1003 select `test`.`t2`.`b` AS `b` from `test`.`t2` where <expr_cache><`test`.`t2`.`b`>(<in_optimizer>(`test`.`t2`.`b`,<exists>(select sum(1) from dual where 1 having (<cache>(`test`.`t2`.`b`) = <ref_null_helper>(sum(1))))))
Note 1003 select `test`.`t2`.`b` AS `b` from `test`.`t2` where <expr_cache><`test`.`t2`.`b`>(<in_optimizer>(`test`.`t2`.`b`,<exists>(select sum(1) from dual having (<cache>(`test`.`t2`.`b`) = <ref_null_helper>(sum(1))))))
DROP TABLE t1,t2;
SET optimizer_switch=@save_optimizer_switch;