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MDEV-6003: EITS: ref access, keypart2=const vs keypart2=expr - inconsistent filtered% value

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- Fix table_cond_selectivity() to work correctly for ref access 
  and "keypart2=const" case.
This commit is contained in:
Sergey Petrunya
2014-04-25 19:04:54 +04:00
parent 182f7d76ee
commit 2acd81af73
3 changed files with 147 additions and 8 deletions
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40
mysql-test/r/selectivity_no_engine.result
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@ -139,6 +139,46 @@ Warnings:
Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`col1` AS `col1`,`test`.`t2`.`col2` AS `col2` from `test`.`t2` where ((`test`.`t2`.`a` in (1,2,3)) and (`test`.`t2`.`b` in (1,2,3)))
drop table t2, t1;
#
# MDEV-6003: EITS: ref access, keypart2=const vs keypart2=expr - inconsistent filtered% value
#
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (
kp1 int, kp2 int,
filler1 char(100),
filler2 char(100),
key(kp1, kp2)
);
insert into t1
select
A.a,
B.a,
'filler-data-1',
'filler-data-2'
from t0 A, t0 B, t0 C;
set histogram_size=100;
set use_stat_tables='preferably';
set optimizer_use_condition_selectivity=4;
analyze table t1 persistent for all;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status Table is already up to date
# NOTE: 10*100%, 10*100% rows is ok
explain extended select * from t0, t1 where t1.kp1=t0.a and t1.kp2=t0.a+1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t1 ref kp1 kp1 10 test.t0.a,func 10 100.00 Using index condition
Warnings:
Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t1`.`kp1` AS `kp1`,`test`.`t1`.`kp2` AS `kp2`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t0` join `test`.`t1` where ((`test`.`t1`.`kp1` = `test`.`t0`.`a`) and (`test`.`t1`.`kp2` = (`test`.`t0`.`a` + 1)))
# NOTE: t0: 10*100% is ok, t1: 10*9.90% is bad. t1 should have 10*100%.
explain extended select * from t0, t1 where t1.kp1=t0.a and t1.kp2=4;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t1 ref kp1 kp1 10 test.t0.a,const 10 100.00
Warnings:
Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t1`.`kp1` AS `kp1`,`test`.`t1`.`kp2` AS `kp2`,`test`.`t1`.`filler1` AS `filler1`,`test`.`t1`.`filler2` AS `filler2` from `test`.`t0` join `test`.`t1` where ((`test`.`t1`.`kp1` = `test`.`t0`.`a`) and (`test`.`t1`.`kp2` = 4))
drop table t0, t1;
#
# End of the test file
#
set use_stat_tables= @save_use_stat_tables;