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This commit is contained in:
Georgi Kodinov 2009-12-10 17:38:01 +02:00
commit 7b174dcafc
3 changed files with 19 additions and 1 deletions
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9
mysql-test/r/order_by.result
View file

@ -1463,6 +1463,15 @@ id select_type table type possible_keys key key_len ref rows Extra
SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c;
col
1
# Must use ref-or-null on the a_c index
EXPLAIN
SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c DESC;
id select_type table type possible_keys key key_len ref rows Extra
x x x ref_or_null a_c,a x x x x x
# Must return 1 row
SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c DESC;
col
1
DROP TABLE t1;
End of 5.0 tests
CREATE TABLE t2 (a varchar(32), b int(11), c float, d double,

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

@ -886,6 +886,15 @@ SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c;
--echo # Must return 1 row
SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c;
# part 2 of the problem : DESC test cases
--echo # Must use ref-or-null on the a_c index
--replace_column 1 x 2 x 3 x 6 x 7 x 8 x 9 x 10 x
EXPLAIN
SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c DESC;
--echo # Must return 1 row
SELECT 1 AS col FROM t1 WHERE a=2 AND (c=10 OR c IS NULL) ORDER BY c DESC;
DROP TABLE t1;

2
sql/sql_select.cc
View file

@ -13487,7 +13487,7 @@ check_reverse_order:
select->quick=tmp;
}
}
else if (tab->type != JT_NEXT &&
else if (tab->type != JT_NEXT && tab->type != JT_REF_OR_NULL &&
tab->ref.key >= 0 && tab->ref.key_parts <= used_key_parts)
{
/*