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Igor Babaev 2011-06-27 23:36:20 -07:00
commit 5ce5e8db92
3 changed files with 104 additions and 1 deletions
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58
mysql-test/r/derived_view.result
View file

@ -645,3 +645,61 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
DROP VIEW v1;
DROP TABLE t1;
#
# LP bug #800535: GROUP BY query with nested left join
# and a derived table in the nest
#
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (1), (2);
CREATE TABLE t2 (a int NOT NULL);
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (3,3), (4,4);
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(t2 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
1 SIMPLE t ALL NULL NULL NULL NULL 2 100.00 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t`.`a` AS `a` from `test`.`t1` left join (`test`.`t2` `t` join `test`.`t3`) on(((`test`.`t`.`a` >= 1) and (`test`.`t3`.`b` > 5))) where 1 group by `test`.`t`.`a`
SELECT t.a FROM t1 LEFT JOIN
(t2 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
a
NULL
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(( SELECT * FROM t2 ) t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(((`test`.`t2`.`a` >= 1) and (`test`.`t3`.`b` > 5))) where 1 group by `test`.`t2`.`a`
SELECT t.a FROM t1 LEFT JOIN
(( SELECT * FROM t2 ) t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
a
NULL
CREATE VIEW v1 AS SELECT * FROM t2;
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(v1 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(((`test`.`t2`.`a` >= 1) and (`test`.`t3`.`b` > 5))) where 1 group by `test`.`t2`.`a`
SELECT t.a FROM t1 LEFT JOIN
(v1 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
a
NULL
DROP VIEW v1;
DROP TABLE t1,t2,t3;

45
mysql-test/t/derived_view.test
View file

@ -277,3 +277,48 @@ SELECT MAX(b) FROM v1 WHERE a=7 AND b<75;
DROP VIEW v1;
DROP TABLE t1;
--echo #
--echo # LP bug #800535: GROUP BY query with nested left join
--echo # and a derived table in the nest
--echo #
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (1), (2);
CREATE TABLE t2 (a int NOT NULL);
INSERT INTO t2 VALUES (1), (2);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (3,3), (4,4);
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(t2 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
SELECT t.a FROM t1 LEFT JOIN
(t2 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(( SELECT * FROM t2 ) t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
SELECT t.a FROM t1 LEFT JOIN
(( SELECT * FROM t2 ) t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
CREATE VIEW v1 AS SELECT * FROM t2;
EXPLAIN EXTENDED
SELECT t.a FROM t1 LEFT JOIN
(v1 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
SELECT t.a FROM t1 LEFT JOIN
(v1 t JOIN t3 ON t3.b > 5) ON t.a >= 1
GROUP BY t.a;
DROP VIEW v1;
DROP TABLE t1,t2,t3;

2
sql/table.cc
View file

@ -4537,7 +4537,7 @@ Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref,
Force creation of nullable item for the result tmp table for outer joined
views/derived tables.
*/
if (view->outer_join)
if (view->table && view->table->maybe_null)
item->maybe_null= TRUE;
/* Save item in case we will need to fall back to materialization. */
view->used_items.push_back(item);