mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-17 04:22:27 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fixed LP bug #804515.

Browse source 
If no index is used to access a materialized derived table or view
then the value of TABLE_REF::key for this table must be (-1).
This commit is contained in:
Igor Babaev 2011-07-01 21:53:47 -07:00
parent 8318ef14af
commit 006dedf537
3 changed files with 60 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
mysql-test/r/derived_view.result
View file

@ -765,3 +765,32 @@ a
SET SESSION optimizer_switch=default;
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# LP bug #804515: materialized derived + ORDER BY
#
CREATE TABLE t1 (f1 varchar(1), f2 varchar(1), KEY (f2));
INSERT INTO t1 VALUES
('r','x'), ('x','d'), ('x','r'), ('r','f'), ('x','x');
CREATE TABLE t2 (f1 varchar(1), f2 varchar(1));
INSERT INTO t2 VALUES ('s','x');
CREATE TABLE t3 (f1 varchar(1), f2 varchar(1), KEY (f2));
INSERT INTO t3 VALUES
(NULL,'x'), (NULL,'f'), ('t','p'), (NULL,'j'), ('g','c');
CREATE TABLE t4 (f1 int, f2 varchar(1), KEY (f2,f1)) ;
INSERT INTO t4 VALUES (1,'x'), (5,'r');
EXPLAIN
SELECT t.f1 AS f
FROM (SELECT DISTINCT t1.* FROM t1,t2 WHERE t2.f2 = t1.f2) t,t3,t4
WHERE t4.f2 = t3.f2 AND t4.f2 = t.f1 ORDER BY f;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where; Using filesort
1 PRIMARY t4 ref f2 f2 4 t.f1 1 Using index
1 PRIMARY t3 ref f2 f2 4 t.f1 2 Using index
2 DERIVED t2 system NULL NULL NULL NULL 1 Using temporary
2 DERIVED t1 ref f2 f2 4 const 2 Using where
SELECT t.f1 AS f
FROM (SELECT DISTINCT t1.* FROM t1,t2 WHERE t2.f2 = t1.f2) t,t3,t4
WHERE t4.f2 = t3.f2 AND t4.f2 = t.f1 ORDER BY f;
f
x
DROP TABLE t1,t2,t3,t4;

29
mysql-test/t/derived_view.test
View file

@ -385,3 +385,32 @@ SET SESSION optimizer_switch=default;
DROP VIEW v1;
DROP TABLE t1,t2,t3;
--echo #
--echo # LP bug #804515: materialized derived + ORDER BY
--echo #
CREATE TABLE t1 (f1 varchar(1), f2 varchar(1), KEY (f2));
INSERT INTO t1 VALUES
('r','x'), ('x','d'), ('x','r'), ('r','f'), ('x','x');
CREATE TABLE t2 (f1 varchar(1), f2 varchar(1));
INSERT INTO t2 VALUES ('s','x');
CREATE TABLE t3 (f1 varchar(1), f2 varchar(1), KEY (f2));
INSERT INTO t3 VALUES
(NULL,'x'), (NULL,'f'), ('t','p'), (NULL,'j'), ('g','c');
CREATE TABLE t4 (f1 int, f2 varchar(1), KEY (f2,f1)) ;
INSERT INTO t4 VALUES (1,'x'), (5,'r');
EXPLAIN
SELECT t.f1 AS f
FROM (SELECT DISTINCT t1.* FROM t1,t2 WHERE t2.f2 = t1.f2) t,t3,t4
WHERE t4.f2 = t3.f2 AND t4.f2 = t.f1 ORDER BY f;
SELECT t.f1 AS f
FROM (SELECT DISTINCT t1.* FROM t1,t2 WHERE t2.f2 = t1.f2) t,t3,t4
WHERE t4.f2 = t3.f2 AND t4.f2 = t.f1 ORDER BY f;
DROP TABLE t1,t2,t3,t4;

3
sql/sql_select.cc
View file

@ -8447,7 +8447,8 @@ void JOIN::drop_unused_derived_keys()
table->max_keys <= 1)
continue;
table->use_index(tab->ref.key);
tab->ref.key= 0;
if (table->s->keys)
tab->ref.key= 0;
}
}