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BUG#27939: Early NULLs filtering doesn't work for eq_ref access

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- Turn it on for JT_EQ_REF access method


mysql-test/r/join.result:
  BUG#27939: Testcase
mysql-test/t/join.test:
  BUG#27939: Testcase
This commit is contained in:
unknown
2007-04-19 03:04:23 +04:00
parent 3e8252ffc6
commit 1b8ecd274e
5 changed files with 127 additions and 2 deletions
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28
mysql-test/r/join.result
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@ -779,4 +779,32 @@ Field Type Null Key Default Extra
Name varchar(50) YES NULL
DROP VIEW v1;
DROP TABLE t1,t2,tv1,tv2;
create table t1 (a int, b int);
insert into t1 values
(NULL, 1),
(NULL, 2),
(NULL, 3),
(NULL, 4);
create table t2 (a int not null, primary key(a));
insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t3 (a int not null, primary key(a));
insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
flush status;
select * from t1, t2, t3 where t3.a=t1.a and t2.a=t1.b;
a b a a
explain select * from t1, t2, t3 where t3.a=t1.a and t2.a=t1.b;
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 eq_ref PRIMARY PRIMARY 4 test.t1.b 1 Using index
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using index
We expect rnd_next=5, and read_key must be 0 because of short-cutting:
show status like 'Handler_read%';
Variable_name Value
Handler_read_first 0
Handler_read_key 0
Handler_read_next 0
Handler_read_prev 0
Handler_read_rnd 0
Handler_read_rnd_next 5
drop table t1, t2, t3;
End of 5.0 tests.