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BUG#978479: Wrong result (extra rows) with derived_with_keys+loosescan+semijoin=ON, materialization=OFF

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- Part#2: Don't try to construct a LooseScan access on indexes that do not guarantee 
  index-ordered reads.
This commit is contained in:
Sergey Petrunya 2012-04-19 05:37:16 +04:00
parent 994c6db2d1
commit b9bbe4a18b
4 changed files with 38 additions and 7 deletions
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19
mysql-test/r/subselect_sj.result
View file

@ -2680,10 +2680,23 @@ EXPLAIN
SELECT * FROM t1 AS t1_1, t1 AS t1_2
WHERE (t1_1.a, t1_2.a) IN ( SELECT a, b FROM v1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_1 ALL NULL NULL NULL NULL 11
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 11 Using where; LooseScan
1 PRIMARY t1_2 ALL NULL NULL NULL NULL 11 Using where
1 PRIMARY t1_1 ALL NULL NULL NULL NULL 11 Using where
1 PRIMARY <derived3> ref key0 key0 5 test.t1_1.a 2 Start temporary
1 PRIMARY t1_2 ALL NULL NULL NULL NULL 11 Using where; End temporary
3 DERIVED t1 ALL NULL NULL NULL NULL 11
SELECT * FROM t1 AS t1_1, t1 AS t1_2
WHERE (t1_1.a, t1_2.a) IN ( SELECT a, b FROM v1 );
a b a b
3 1 9 1
5 8 4 0
3 9 9 1
2 4 6 8
2 4 4 0
2 6 6 8
2 6 4 0
5 4 4 0
7 7 7 7
5 4 4 0
DROP VIEW v1;
DROP TABLE t1;
set @@join_cache_level= @tmp_jcl_978479;

19
mysql-test/r/subselect_sj_jcl6.result
View file

@ -2694,10 +2694,23 @@ EXPLAIN
SELECT * FROM t1 AS t1_1, t1 AS t1_2
WHERE (t1_1.a, t1_2.a) IN ( SELECT a, b FROM v1 );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1_1 ALL NULL NULL NULL NULL 11
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 11 Using where; LooseScan
1 PRIMARY t1_2 ALL NULL NULL NULL NULL 11 Using where
1 PRIMARY t1_1 ALL NULL NULL NULL NULL 11 Using where
1 PRIMARY <derived3> ref key0 key0 5 test.t1_1.a 2 Start temporary
1 PRIMARY t1_2 ALL NULL NULL NULL NULL 11 Using where; End temporary
3 DERIVED t1 ALL NULL NULL NULL NULL 11
SELECT * FROM t1 AS t1_1, t1 AS t1_2
WHERE (t1_1.a, t1_2.a) IN ( SELECT a, b FROM v1 );
a b a b
3 1 9 1
5 8 4 0
3 9 9 1
2 4 6 8
2 4 4 0
2 6 6 8
2 6 4 0
5 4 4 0
7 7 7 7
5 4 4 0
DROP VIEW v1;
DROP TABLE t1;
set @@join_cache_level= @tmp_jcl_978479;

3
mysql-test/t/subselect_sj.test
View file

@ -2390,6 +2390,9 @@ EXPLAIN
SELECT * FROM t1 AS t1_1, t1 AS t1_2
WHERE (t1_1.a, t1_2.a) IN ( SELECT a, b FROM v1 );
SELECT * FROM t1 AS t1_1, t1 AS t1_2
WHERE (t1_1.a, t1_2.a) IN ( SELECT a, b FROM v1 );
DROP VIEW v1;
DROP TABLE t1;
set @@join_cache_level= @tmp_jcl_978479;

4
sql/opt_subselect.h
View file

@ -130,7 +130,9 @@ public:
void add_keyuse(table_map remaining_tables, KEYUSE *keyuse)
{
if (try_loosescan && keyuse->sj_pred_no != UINT_MAX)
if (try_loosescan && keyuse->sj_pred_no != UINT_MAX &&
(keyuse->table->file->index_flags(keyuse->key, 0, 1 ) & HA_READ_ORDER))
{
if (!(remaining_tables & keyuse->used_tables))
{