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Fixed bug mdev-3851.

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Any ref access to a table by a key fully extended by the components
of the primary key should be actually an eq_ref access.
This commit is contained in:
Igor Babaev
2012-11-11 11:47:44 -08:00
parent 0380b0e280
commit e08f4f1630
5 changed files with 61 additions and 10 deletions
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20
mysql-test/r/innodb_ext_key.result
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@ -613,6 +613,26 @@ Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
#
# Bug mdev-3851: ref access used instead of expected eq_ref access
# when extended_keys=on
#
create table t0 (a int);
insert into t0 values (1), (2), (3), (4), (5);
create index i_p_size on part(p_size);
set optimizer_switch='extended_keys=on';
explain
select * from t0, part ignore index (primary)
where p_partkey=t0.a and p_size=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 ALL NULL NULL NULL NULL 5 Using where
1 SIMPLE part eq_ref i_p_size i_p_size 9 const,dbt3_s001.t0.a 1
select * from t0, part ignore index (primary)
where p_partkey=t0.a and p_size=1;
a p_partkey p_name p_mfgr p_brand p_type p_size p_container p_retailprice p_comment
2 2 blush rosy metallic lemon navajo Manufacturer#1 Brand#13 LARGE BRUSHED BRASS 1 LG CASE 902 final platelets hang f
drop table t0;
drop index i_p_size on part;
DROP DATABASE dbt3_s001;
use test;
#