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Bug #31974: Wrong EXPLAIN output

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The fix for bug 31148 is not correct. It does not
have a relation to the problem described in this bug.
And removing the fix will not make the bug to re-appear.
Fixed the bug #31974 by removing the fix for bug 31148
and adding a test case.


mysql-test/r/key.result:
  Bug #31974: test case
mysql-test/t/key.test:
  Bug #31974: test case
sql/sql_select.cc:
  Bug #31974: revert the fix for bug 31148
This commit is contained in:
unknown 2007-11-05 13:19:56 +02:00
parent 6a79a2196f
commit 860f7db3b9
3 changed files with 31 additions and 7 deletions
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14
mysql-test/r/key.result
View file

@ -545,3 +545,17 @@ c1
1
1
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT, INDEX (a,b));
INSERT INTO t1 (a, b)
VALUES
(1,1), (1,2), (1,3), (1,4), (1,5),
(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6);
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t1 range NULL a 5 NULL 8 Using index for group-by
SELECT 1 as RES FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
RES
DROP TABLE t1;

17
mysql-test/t/key.test
View file

@ -524,3 +524,20 @@ ORDER BY (
LIMIT 1);
DROP TABLE t1;
#
# Bug #31974: Wrong EXPLAIN output
#
CREATE TABLE t1 (a INT, b INT, INDEX (a,b));
INSERT INTO t1 (a, b)
VALUES
(1,1), (1,2), (1,3), (1,4), (1,5),
(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6);
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
SELECT 1 as RES FROM t1 AS t1_outer WHERE
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
DROP TABLE t1;

7
sql/sql_select.cc
View file

@ -6651,14 +6651,7 @@ void JOIN::cleanup(bool full)
for (tab= join_tab, end= tab+tables; tab != end; tab++)
{
if (tab->table)
{
if (tab->table->key_read)
{
tab->table->key_read= 0;
tab->table->file->extra(HA_EXTRA_NO_KEYREAD);
}
tab->table->file->ha_index_or_rnd_end();
}
}
}
}