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BUG#14940 "MySQL choose wrong index", v.2

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- Make the range-et-al optimizer produce E(#table records after table 
                                           condition is applied),
- Make the join optimizer use this value,
- Add "filtered" column to EXPLAIN EXTENDED to show 
  fraction of records left after table condition is applied
- Adjust test results, add comments
This commit is contained in:
sergefp@mysql.com
2006-07-28 21:27:01 +04:00
parent 1459784aba
commit 699291a8e6
75 changed files with 942 additions and 683 deletions
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4
mysql-test/r/varbinary.result
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@@ -12,8 +12,8 @@ create table t1 (ID int(8) unsigned zerofill not null auto_increment,UNIQ bigint
insert into t1 set UNIQ=0x38afba1d73e6a18a;
insert into t1 set UNIQ=123;
explain extended select * from t1 where UNIQ=0x38afba1d73e6a18a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 const UNIQ UNIQ 8 const 1
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 const UNIQ UNIQ 8 const 1 100.00
Warnings:
Note 1003 select `test`.`t1`.`ID` AS `ID`,`test`.`t1`.`UNIQ` AS `UNIQ` from `test`.`t1` where 1
drop table t1;