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Fixed LP bug #874006.

Browse Source 
This bug manifested itself with queries containing non-correlated
IN subqueries over materialized views/derived tables.  
The bug happened because the code of the function generate_derived_keys did
not take into account that the function could be called twice when the
optimizer was deciding whether in-exist transformation should be applied.
This commit is contained in:
Igor Babaev
2011-10-16 13:23:57 -07:00
parent 5e4a381cc5
commit f5955f87c6
4 changed files with 113 additions and 17 deletions
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44
mysql-test/r/derived_view.result
View File

@ -781,7 +781,7 @@ SELECT * FROM t3
WHERE t3.a IN (SELECT v1.a FROM v1, t2 WHERE t2.a = v1.b);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 4 100.00 Using where
2 DEPENDENT SUBQUERY <derived3> ref key0 key0 5 func 2 100.00
2 DEPENDENT SUBQUERY <derived3> ref key1 key1 5 func 2 100.00
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
3 DERIVED t1 ALL NULL NULL NULL NULL 3 100.00 Using temporary; Using filesort
Warnings:
@ -1462,4 +1462,46 @@ b a
9 2
7 2
DROP TABLE t1,t2,t3;
#
# LP bug #874006: materialized view used in IN subquery
#
CREATE TABLE t3 (a int NOT NULL, b varchar(1), c varchar(1));
INSERT INTO t3 VALUES (19,NULL,NULL), (20,'r','r');
CREATE TABLE t1 (a int, b varchar(1) , c varchar(1));
INSERT INTO t1 VALUES (1,NULL,NULL), (5,'r','r'), (7,'y','y');
CREATE TABLE t2 (a int NOT NULL , b int, c varchar(1));
INSERT INTO t2 VALUES (4,3,'r');
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
SET SESSION optimizer_switch='derived_with_keys=off';
EXPLAIN
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY <derived3> ALL NULL NULL NULL NULL 3 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 3
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
a b c
20 r r
SET SESSION optimizer_switch='derived_with_keys=on';
EXPLAIN
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY <derived3> ref key1 key1 10 const,const 0 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 3
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
a b c
20 r r
DROP VIEW v1;
DROP TABLE t1,t2,t3;
set optimizer_switch=@exit_optimizer_switch;

37
mysql-test/t/derived_view.test
View File

@ -910,5 +910,42 @@ SELECT * FROM t1 , t2
DROP TABLE t1,t2,t3;
--echo #
--echo # LP bug #874006: materialized view used in IN subquery
--echo #
CREATE TABLE t3 (a int NOT NULL, b varchar(1), c varchar(1));
INSERT INTO t3 VALUES (19,NULL,NULL), (20,'r','r');
CREATE TABLE t1 (a int, b varchar(1) , c varchar(1));
INSERT INTO t1 VALUES (1,NULL,NULL), (5,'r','r'), (7,'y','y');
CREATE TABLE t2 (a int NOT NULL , b int, c varchar(1));
INSERT INTO t2 VALUES (4,3,'r');
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
SET SESSION optimizer_switch='derived_with_keys=off';
EXPLAIN
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
SET SESSION optimizer_switch='derived_with_keys=on';
EXPLAIN
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
DROP VIEW v1;
DROP TABLE t1,t2,t3;
# The following command must be the last one the file
set optimizer_switch=@exit_optimizer_switch;