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Merge fix for bug#17711

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This commit is contained in:
unknown 2007-01-11 16:20:08 +03:00
commit 0fdd3dce16
3 changed files with 18 additions and 1 deletions
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7
mysql-test/r/delete.result
View file

@ -186,4 +186,11 @@ select count(*) from t1;
count(*)
0
drop table t1;
create table t1(f1 int primary key);
insert into t1 values (4),(3),(1),(2);
delete from t1 where (@a:= f1) order by f1 limit 1;
select @a;
@a
1
drop table t1;
End of 4.1 tests

10
mysql-test/t/delete.test
View file

@ -174,4 +174,14 @@ delete from t1 where a is null;
select count(*) from t1;
drop table t1;
#
# Bug#17711: DELETE doesn't use index when ORDER BY, LIMIT and
# non-restricting WHERE is present.
#
create table t1(f1 int primary key);
insert into t1 values (4),(3),(1),(2);
delete from t1 where (@a:= f1) order by f1 limit 1;
select @a;
drop table t1;
--echo End of 4.1 tests

2
sql/sql_delete.cc
View file

@ -142,7 +142,7 @@ int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
DBUG_RETURN(-1); // This will force out message
}
if (!select && limit != HA_POS_ERROR)
if ((!select || table->quick_keys.is_clear_all()) && limit != HA_POS_ERROR)
usable_index= get_index_for_order(table, (ORDER*)(order->first), limit);
if (usable_index == MAX_KEY)