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BUG#20389: Crash when using index scan in reverse order

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mysql-test/r/partition_order.result:
  Changed a test case to handle ordered index scan reverse order as well
mysql-test/t/partition_order.test:
  Changed a test case to handle ordered index scan reverse order as well
sql/ha_myisam.cc:
  More debug info
sql/ha_partition.cc:
  Introduced partition_index_read_last to ensure we use index_read_last in those
  cases towards underlying handler.
  Ensured that index_read with HA_READ_PREFIX_LAST, HA_READ_PREFIX_LAST_OR_PREV and
  HA_READ_BEFORE_KEY uses ordered index scan in reverse order.
sql/ha_partition.h:
  Introduced partition_index_read_last to ensure we use index_read_last in those
  cases towards underlying handler.
  Ensured that index_read with HA_READ_PREFIX_LAST, HA_READ_PREFIX_LAST_OR_PREV and
  HA_READ_BEFORE_KEY uses ordered index scan in reverse order.
This commit is contained in:
unknown 2006-07-15 03:38:34 -04:00
commit dd72905716
5 changed files with 98 additions and 14 deletions
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56
mysql-test/r/partition_order.result
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@ -718,7 +718,11 @@ partitions 2
partition x2 values less than (100));
INSERT into t1 values (1, 1);
INSERT into t1 values (5, NULL);
INSERT into t1 values (2, 5);
INSERT into t1 values (2, 4);
INSERT into t1 values (3, 3);
INSERT into t1 values (4, 5);
INSERT into t1 values (7, 1);
INSERT into t1 values (6, 6);
INSERT into t1 values (30, 4);
INSERT into t1 values (35, 2);
INSERT into t1 values (40, NULL);
@ -727,7 +731,55 @@ a b
5 NULL
40 NULL
1 1
7 1
35 2
3 3
2 4
30 4
2 5
4 5
6 6
select * from t1 force index (b) where b < 10 ORDER BY b;
a b
1 1
7 1
35 2
3 3
2 4
30 4
4 5
6 6
select * from t1 force index (b) where b < 10 ORDER BY b DESC;
a b
6 6
4 5
2 4
30 4
3 3
35 2
7 1
1 1
drop table t1;
create table t1 (a int not null, b int, c varchar(20), key (a,b,c))
partition by range (b)
(partition p0 values less than (5),
partition p1 values less than (10));
INSERT into t1 values (1,1,'1'),(2,2,'2'),(1,3,'3'),(2,4,'4'),(1,5,'5');
INSERT into t1 values (2,6,'6'),(1,7,'7'),(2,8,'8'),(1,9,'9');
INSERT into t1 values (1, NULL, NULL), (2, NULL, '10');
select * from t1 where a = 1 order by a desc, b desc;
a b c
1 9 9
1 7 7
1 5 5
1 3 3
1 1 1
1 NULL NULL
select * from t1 where a = 1 order by b desc;
a b c
1 9 9
1 7 7
1 5 5
1 3 3
1 1 1
1 NULL NULL
drop table t1;