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# Initialize
--disable_warnings
drop table if exists t1,t2,t3;
--enable_warnings
set @exit_optimizer_switch=@@optimizer_switch;
set optimizer_switch='derived_merge=on,derived_with_keys=on';
# The 'default' value within the scope of this test:
set @save_optimizer_switch=@@optimizer_switch;
CREATE TABLE t1 (a int not null, b char (10) not null);
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
CREATE TABLE t2 (a int not null, b char (10) not null);
insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
CREATE TABLE t3 (a int not null, b char (10) not null);
insert into t3 values (3,'f'),(4,'y'),(5,'z'),(6,'c');
select * from t1 as x1, (select * from t1) as x2;
explain select * from t1 as x1, (select * from t1) as x2;
drop table if exists t2,t3;
CREATE TABLE t2 (a int not null);
insert into t2 values(1);
select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1;
explain select * from (select t1.*, t2.a as t2a from t1,t2 where t1.a=t2.a) t1;
drop table t1, t2;
create table t1(a int not null, t char(8), index(a));
--disable_query_log
begin;
let $1 = 10000;
while ($1)
{
eval insert into t1 values ($1,'$1');
dec $1;
}
commit;
--enable_query_log
SELECT * FROM (SELECT * FROM t1) as b ORDER BY a ASC LIMIT 0,20;
explain select count(*) from t1 as tt1, (select * from t1) as tt2;
drop table t1;
#
# test->used_keys test for derived tables
#
create table t1 (mat_id MEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, matintnum CHAR(6) NOT NULL, test MEDIUMINT UNSIGNED NULL);
create table t2 (mat_id MEDIUMINT UNSIGNED NOT NULL, pla_id MEDIUMINT UNSIGNED NOT NULL);
insert into t1 values (NULL, 'a', 1), (NULL, 'b', 2), (NULL, 'c', 3), (NULL, 'd', 4), (NULL, 'e', 5), (NULL, 'f', 6), (NULL, 'g', 7), (NULL, 'h', 8), (NULL, 'i', 9);
insert into t2 values (1, 100), (1, 101), (1, 102), (2, 100), (2, 103), (2, 104), (3, 101), (3, 102), (3, 105);
SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
explain SELECT STRAIGHT_JOIN d.pla_id, m2.mat_id FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
explain SELECT STRAIGHT_JOIN d.pla_id, m2.test FROM t1 m2 INNER JOIN (SELECT mp.pla_id, MIN(m1.matintnum) AS matintnum FROM t2 mp INNER JOIN t1 m1 ON mp.mat_id=m1.mat_id GROUP BY mp.pla_id) d ON d.matintnum=m2.matintnum;
drop table t1,t2;
#
# deived tables with subquery inside all by one table
#
create table t1 (E1 INTEGER UNSIGNED NOT NULL, E2 INTEGER UNSIGNED NOT NULL, E3 INTEGER UNSIGNED NOT NULL, PRIMARY KEY(E1)
);
insert into t1 VALUES(1,1,1), (2,2,1);
select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
explain select count(*) from t1 INNER JOIN (SELECT A.E1, A.E2, A.E3 FROM t1 AS A WHERE A.E3 = (SELECT MAX(B.E3) FROM t1 AS B WHERE A.E2 = B.E2)) AS THEMAX ON t1.E1 = THEMAX.E2 AND t1.E1 = t1.E2;
drop table t1;
create table t1 (a int);
insert into t1 values (1),(2);
select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
explain select * from ( select * from t1 union select * from t1) a,(select * from t1 union select * from t1) b;
drop table t1;
#
# "Using index" in explain
#
create table t2 (a int, b int, primary key (a));
insert into t2 values (1,7),(2,7);
explain select a from t2 where a>1;
explain select a from (select a from t2 where a>1) tt;
drop table t2;
#
# prepared EXPLAIN
#
create table t1
(
c1 tinyint, c2 smallint, c3 mediumint, c4 int,
c5 integer, c6 bigint, c7 float, c8 double,
c9 double precision, c10 real, c11 decimal(7, 4), c12 numeric(8, 4),
c13 date, c14 datetime, c15 timestamp, c16 time,
c17 year, c18 bit, c19 bool, c20 char,
c21 char(10), c22 varchar(30), c23 tinyblob, c24 tinytext,
c25 blob, c26 text, c27 mediumblob, c28 mediumtext,
c29 longblob, c30 longtext, c31 enum('one', 'two', 'three'),
c32 set('monday', 'tuesday', 'wednesday')
) engine = MYISAM ;
create table t2 like t1;
set @save_optimizer_switch=@@optimizer_switch;
set @@optimizer_switch="partial_match_rowid_merge=off,partial_match_table_scan=off";
set @stmt= ' explain SELECT (SELECT SUM(c1 + c12 + 0.0) FROM t2 where (t1.c2 - 0e-3) = t2.c2 GROUP BY t1.c15 LIMIT 1) as scalar_s, exists (select 1.0e+0 from t2 where t2.c3 * 9.0000000000 = t1.c4) as exists_s, c5 * 4 in (select c6 + 0.3e+1 from t2) as in_s, (c7 - 4, c8 - 4) in (select c9 + 4.0, c10 + 40e-1 from t2) as in_row_s FROM t1, (select c25 x, c32 y from t2) tt WHERE x * 1 = c25 ' ;
prepare stmt1 from @stmt ;
execute stmt1 ;
execute stmt1 ;
explain SELECT (SELECT SUM(c1 + c12 + 0.0) FROM t2 where (t1.c2 - 0e-3) = t2.c2 GROUP BY t1.c15 LIMIT 1) as scalar_s, exists (select 1.0e+0 from t2 where t2.c3 * 9.0000000000 = t1.c4) as exists_s, c5 * 4 in (select c6 + 0.3e+1 from t2) as in_s, (c7 - 4, c8 - 4) in (select c9 + 4.0, c10 + 40e-1 from t2) as in_row_s FROM t1, (select c25 x, c32 y from t2) tt WHERE x * 1 = c25;
deallocate prepare stmt1;
drop tables t1,t2;
set @@optimizer_switch=@save_optimizer_switch;
--echo #
--echo # LP bug #793436: query with a derived table for which optimizer proves
--echo # that it contains not more than 1 row
--echo #
CREATE TABLE t1 (a int, KEY (a)) ;
INSERT INTO t1 VALUES (3), (1);
CREATE TABLE t2 (a int);
INSERT INTO t2 VALUES (3);
EXPLAIN
SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1 WHERE t1.a = t.a;
SELECT * FROM (SELECT DISTINCT * FROM t2) t, t1 WHERE t1.a = t.a;
DROP TABLE t1,t2;
--echo #
--echo # LP bug #800518: crash with a query over a derived table
--echo # when a min/max optimization is applied
--echo #
CREATE TABLE t1 (a int, b int, c varchar(10), INDEX idx(a,b)) ;
INSERT INTO t1 VALUES
(100, 3, 'xxx'), (200, 7, 'yyyyyyy'), (100, 1, 't'),
(200, 4, 'aaaa'), (100, 3, 'eee'), (100, 5, 'zzzzz');
EXPLAIN
SELECT MAX(b) FROM (SELECT * FROM t1) AS t WHERE a = 100;
SELECT MAX(b) FROM (SELECT * FROM t1) AS t WHERE a = 100;
DROP TABLE t1;
--echo #
--echo # LP bug #799499: query over a materialized view
--echo # accessed by a key
--echo #
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (8);
CREATE TABLE t2 (a int, b int) ;
INSERT INTO t2 VALUES
(262, NULL), (253, 190), (260, NULL), (250, 163), (188, 8),
(257,200), (256, NULL), (255, 8), (249, NULL), (259, 7);
CREATE VIEW v1 AS SELECT a, MIN(b) AS b FROM t2 GROUP BY a;
EXPLAIN
SELECT * FROM v1, t1 WHERE v1.b=t1.a ORDER BY v1.a;
SELECT * FROM v1, t1 WHERE v1.b=t1.a ORDER BY v1.a;
DROP VIEW v1;
DROP TABLE t1,t2;
--echo #
--echo # LP bug #800085: crash with a query using a simple derived table
--echo # (fixed by the patch for bug 798621)
--echo #
CREATE TABLE t1 (f1 int, f2 varchar(32)) ;
INSERT INTO t1 VALUES (NULL,'j'), (8,'c');
CREATE TABLE t2 (f1 int);
INSERT INTO t2 VALUES (1), (5);
SELECT DISTINCT t.f1 FROM (SELECT * FROM t1) AS t, t2
WHERE t.f2='s' AND t.f2 LIKE '%a%' OR t.f1<>0 ORDER BY t.f2;
DROP TABLE t1, t2;
--echo #
--echo # BUG##806524: Assertion `join->best_read < 1.7976931348623157e+308 with table_elimination=on and derived_merge=on
--echo #
CREATE TABLE t1 ( f4 int) ;
CREATE TABLE t2 ( f4 int) ;
CREATE TABLE t3 ( f1 int NOT NULL , PRIMARY KEY (f1)) ;
CREATE TABLE t4 ( f2 int, f4 int) ;
SELECT *
FROM ( SELECT * FROM t1 ) AS alias1
RIGHT JOIN (
t2 AS alias2
LEFT JOIN (
SELECT t4.*
FROM ( SELECT * FROM t3 ) AS SQ1_alias1
RIGHT JOIN t4
ON t4.f2 = SQ1_alias1.f1
) AS alias3
ON alias3.f4 != 0
) ON alias3.f4 != 0;
drop table t1,t2,t3,t4;
# The following command must be the last one the file
set optimizer_switch=@exit_optimizer_switch;
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