Commit 1f3df2e6 authored by ingo@mysql.com's avatar ingo@mysql.com
Browse files

Bug#14616 - Freshly imported table returns error 124 when using LIMIT 

Initialized usable_keys from table->keys_in_use instead of ~0
in test_if_skip_sort_order(). It was possible that a disabled
index was used for sorting.
parent 8243eee9

mysql-test/r/myisam.result

+10 −0
Original line number Diff line number Diff line
@@ -462,3 +462,13 @@ select count(*) from t1 where a is null; 
count(*)

2

drop table t1;

create table t1 (

c1 varchar(32),

key (c1)

) engine=myisam;

alter table t1 disable keys;

insert into t1 values ('a'), ('b');

select c1 from t1 order by c1 limit 1;

c1

a

drop table t1;

mysql-test/t/myisam.test

+12 −0
Original line number Diff line number Diff line
@@ -446,3 +446,15 @@ explain select count(*) from t1 where a is null; 
select count(*) from t1 where a is null;

drop table t1;



#

# Bug#14616 - Freshly imported table returns error 124 when using LIMIT

#

create table t1 (

  c1 varchar(32),

  key (c1)

) engine=myisam;

alter table t1 disable keys;

insert into t1 values ('a'), ('b');

select c1 from t1 order by c1 limit 1;

drop table t1;

sql/sql_select.cc

+6 −2
Original line number Diff line number Diff line
@@ -6003,8 +6003,12 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit, 
  key_map usable_keys;

  DBUG_ENTER("test_if_skip_sort_order");



  /* Check which keys can be used to resolve ORDER BY */

  usable_keys= ~(key_map) 0;

  /*

    Check which keys can be used to resolve ORDER BY.

    We must not try to use disabled keys.

  */

  usable_keys= table->keys_in_use;



  for (ORDER *tmp_order=order; tmp_order ; tmp_order=tmp_order->next)

  {

    if ((*tmp_order->item)->type() != Item::FIELD_ITEM)