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Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

Browse source 
into  rakia.(none):/home/kgeorge/mysql/autopush/B21159-5.0-opt


sql/sql_select.cc:
  Auto merged
This commit is contained in:
unknown 2006-08-15 10:25:56 +03:00
commit a0474a811c
3 changed files with 32 additions and 1 deletions
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7
mysql-test/r/compare.result
View file

@ -42,3 +42,10 @@ CHAR(31) = '' '' = CHAR(31)
SELECT CHAR(30) = '', '' = CHAR(30);
CHAR(30) = '' '' = CHAR(30)
0 0
create table t1 (a tinyint(1),b binary(1));
insert into t1 values (0x01,0x01);
select * from t1 where a=b;
a b
select * from t1 where a=b and b=0x01;
a b
drop table if exists t1;

9
mysql-test/t/compare.test
View file

@ -37,3 +37,12 @@ SELECT CHAR(31) = '', '' = CHAR(31);
SELECT CHAR(30) = '', '' = CHAR(30);
# End of 4.1 tests
#
#Bug #21159: Optimizer: wrong result after AND with different data types
#
create table t1 (a tinyint(1),b binary(1));
insert into t1 values (0x01,0x01);
select * from t1 where a=b;
select * from t1 where a=b and b=0x01;
drop table if exists t1;

17
sql/sql_select.cc
View file

@ -6499,8 +6499,23 @@ static bool check_equality(Item *item, COND_EQUAL *cond_equal)
field_item= (Item_field*) right_item;
const_item= left_item;
}
/*
Disable const propagation for Item_hex_string.
This must be done because Item_hex_string->val_int() is not
the same as (Item_hex_string->val_str() in BINARY column)->val_int().
We cannot simply disable the replacement in a particular context (
e.g. <bin_col> = <int_col> AND <bin_col> = <hex_string>) since
Items don't know the context they are in and there are functions like
IF (<hex_string>, 'yes', 'no').
Note that this will disable some valid cases as well
(e.g. : <bin_col> = <hex_string> AND <bin_col2> = <bin_col>) but
there's no way to distinguish the valid cases without having the
Item's parent say something like : Item->set_context(Item::STRING_RESULT)
and have all the Items that contain other Items do that consistently.
*/
if (const_item &&
field_item->result_type() == const_item->result_type())
field_item->result_type() == const_item->result_type() &&
const_item->type() != Item::VARBIN_ITEM)
{
bool copyfl;