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mariadb/mysql-test/main/subselect2.result
Monty 515b9ad05a Added EQ_REF chaining to the greedy_optimizer 
MDEV-28073 Slow query performance in MariaDB when using many table

The idea is to prefer and chain EQ_REF tables (tables that uses an
unique key to find a row) when searching for the best table combination.
This significantly reduces row combinations that has to be examined.
This is optimization is enabled when setting optimizer_prune_level=2
(which is now default).

Implementation:
- optimizer_prune_level has a new level, 2, which enables EQ_REF
  optimization in addition to the pruning done by level 1.
  Level 2 is now default.
- Added JOIN::eq_ref_tables that contains bits of tables that could use
  potentially use EQ_REF access in the query.  This is calculated
  in sort_and_filter_keyuse()

Under optimizer_prune_level=2:
- When the greedy_optimizer notices that the preceding table was an
  EQ_REF table, it tries to add an EQ_REF table next. If an EQ_REF
  table exists, only this one will be considered at this level.
  We also collect all EQ_REF tables chained by the next levels and these
  are ignored on the starting level as we have already examined these.
  If no EQ_REF table exists, we continue as normal.

This optimization speeds up the greedy_optimizer combination test with
~25%

Other things:
- I ported the changes in MySQL 5.7 to greedy_optimizer.test to MariaDB
  to be able to ensure we can handle all cases that MySQL can do.
- I have run all tests with --mysqld=--optimizer_prune_level=1 to verify that
  there where no test changes.
2022-07-26 22:27:29 +07:00

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drop table if exists t1, t2, t3, t4;
set @subselect2_test_tmp=@@optimizer_switch;
set optimizer_switch='semijoin=on,firstmatch=on,mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
CREATE TABLE t1
(
DOCID VARCHAR(32)BINARY NOT NULL
, UUID VARCHAR(32)BINARY NOT NULL
, MIMETYPE VARCHAR(80)BINARY
, CONTENTDATA LONGBLOB
, CONTENTSIZE INTEGER
, VERSIONID INTEGER
, REPID VARCHAR(32)BINARY
, MODIFIED TIMESTAMP
, MODIFIER VARCHAR(255)BINARY
, ORIGINATOR INTEGER
, PRIMARY KEY ( DOCID )
) ENGINE=InnoDB
;
INSERT IGNORE INTO t1 (DOCID) VALUES ("1"), ("2");
Warnings:
Warning 1364 Field 'UUID' doesn't have a default value
CREATE TABLE t2
(
DOCID VARCHAR(32)BINARY NOT NULL
, DOCNAME VARCHAR(255)BINARY NOT NULL
, DOCTYPEID VARCHAR(32)BINARY NOT NULL
, FOLDERID VARCHAR(32)BINARY NOT NULL
, AUTHOR VARCHAR(255)BINARY
, CREATED TIMESTAMP NOT NULL
, TITLE VARCHAR(255)BINARY
, SUBTITLE VARCHAR(255)BINARY
, DOCABSTRACT LONGBLOB
, PUBLISHDATE TIMESTAMP
, EXPIRATIONDATE TIMESTAMP
, LOCKEDBY VARCHAR(80)BINARY
, STATUS VARCHAR(80)BINARY
, PARENTDOCID VARCHAR(32)BINARY
, REPID VARCHAR(32)BINARY
, MODIFIED TIMESTAMP NOT NULL
, MODIFIER VARCHAR(255)BINARY NOT NULL
, PUBLISHSTATUS INTEGER
, ORIGINATOR INTEGER
, PRIMARY KEY ( DOCID )
) ENGINE=InnoDB
;
CREATE INDEX DDOCTYPEID_IDX ON t2 (DOCTYPEID);
CREATE INDEX DFOLDERID_IDX ON t2 (FOLDERID);
CREATE TABLE t3
(
FOLDERID VARCHAR(32)BINARY NOT NULL
, FOLDERNAME VARCHAR(255)BINARY NOT NULL
, CREATOR VARCHAR(255)BINARY
, CREATED TIMESTAMP NOT NULL
, DESCRIPTION VARCHAR(255)BINARY
, FOLDERTYPE INTEGER NOT NULL
, MODIFIED TIMESTAMP
, MODIFIER VARCHAR(255)BINARY
, FOLDERSIZE INTEGER NOT NULL
, PARENTID VARCHAR(32)BINARY
, REPID VARCHAR(32)BINARY
, ORIGINATOR INTEGER
, PRIMARY KEY ( FOLDERID )
) ENGINE=InnoDB;
CREATE INDEX FFOLDERID_IDX ON t3 (FOLDERID);
CREATE INDEX CMFLDRPARNT_IDX ON t3 (PARENTID);
CREATE TABLE t4
(
DOCTYPEID VARCHAR(32)BINARY NOT NULL
, DOCTYPENAME VARCHAR(80)BINARY NOT NULL
, DESCRIPTION VARCHAR(255)BINARY
, EXTNDATA LONGBLOB
, MODIFIED TIMESTAMP
, MODIFIER VARCHAR(255)BINARY
, ORIGINATOR INTEGER
, PRIMARY KEY ( DOCTYPEID )
) ENGINE=InnoDB;
INSERT INTO t2 VALUES("c373e9f59cf15a6c3e57444553544200", "c373e9f59cf15a6c3e57444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-06 07:48:42", NULL, NULL, NULL, "2003-06-06 07:48:42", "2003-06-06 07:48:42", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-06 07:48:42", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5a472f43ba45e444553544200", "c373e9f5a472f43ba45e444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-07 18:50:12", NULL, NULL, NULL, "2003-06-07 18:50:12", "2003-06-07 18:50:12", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-07 18:50:12", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5a4a0f56014eb444553544200", "c373e9f5a4a0f56014eb444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-07 19:39:26", NULL, NULL, NULL, "2003-06-07 19:39:26", "2003-06-07 19:39:26", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-07 19:39:26", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5a4a0f8fa4a86444553544200", "c373e9f5a4a0f8fa4a86444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-07 19:43:05", NULL, NULL, NULL, "2003-06-07 19:43:05", "2003-06-07 19:43:05", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-07 19:43:05", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5ac7b537205ce444553544200", "c373e9f5ac7b537205ce444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-09 08:15:24", NULL, NULL, NULL, "2003-06-09 08:15:24", "2003-06-09 08:15:24", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 08:15:24", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5ad0792012454444553544200", "c373e9f5ad0792012454444553544200", "340d243d45f111d497b00010a4ef934d", "2f6161e879db43c1a5b82c21ddc49089", NULL, "2003-06-09 10:51:44", NULL, NULL, NULL, "2003-06-09 10:51:44", "2003-06-09 10:51:44", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 10:51:44", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5ad079821ef34444553544200", "First Discussion", "c373e9f5ad079174ff17444553544200", "c373e9f5ad0796c0eca4444553544200", "Goldilocks", "2003-06-09 11:16:50", "Title: First Discussion", NULL, NULL, "2003-06-09 10:51:26", "2003-06-09 10:51:26", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 11:16:50", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5ad07993f3859444553544200", "Last Discussion", "c373e9f5ad079174ff17444553544200", "c373e9f5ad0796c0eca4444553544200", "Goldilocks", "2003-06-09 11:21:06", "Title: Last Discussion", NULL, "Setting new abstract and keeping doc checked out", "2003-06-09 10:51:26", "2003-06-09 10:51:26", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 11:21:06", "admin", "0", NULL);
INSERT INTO t2 VALUES("c373e9f5ad079a3219c4444553544200", "testdoclayout", "340d243c45f111d497b00010a4ef934d", "c373e9f5ad0796c0eca4444553544200", "Goldilocks", "2003-06-09 11:25:31", "Title: Test doc layout", "Subtitle: test doc layout", NULL, "2003-06-09 10:51:27", "2003-06-09 10:51:27", NULL, NULL, NULL, "03eea05112b845949f3fd03278b5fe43", "2003-06-09 11:25:31", "admin", "0", NULL);
INSERT INTO t3 VALUES("0c9aab05b15048c59bc35c8461507deb", "System", "System", "2003-06-05 16:30:00", "The system content repository folder.", "3", "2003-06-05 16:30:00", "System", "0", NULL, "9c9aab05b15048c59bc35c8461507deb", "1");
INSERT INTO t3 VALUES("2f6161e879db43c1a5b82c21ddc49089", "Default", "System", "2003-06-09 10:52:02", "The default content repository folder.", "3", "2003-06-05 16:30:00", "System", "0", NULL, "03eea05112b845949f3fd03278b5fe43", "1");
INSERT INTO t3 VALUES("c373e9f5ad0791724315444553544200", "AddDocumentTest", "admin", "2003-06-09 10:51:25", "Movie Reviews", "0", "2003-06-09 10:51:25", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad07919e1963444553544200", "NewDestDirectory", "admin", "2003-06-09 10:51:28", "Adding new directory", "128", "2003-06-09 10:51:28", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad07919fe525444553544200", "SubDestDirectory", "admin", "2003-06-09 10:51:28", "Adding new directory", "128", "2003-06-09 10:51:28", "admin", "0", "c373e9f5ad07919e1963444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791a0dab5444553544200", "Level1", "admin", "2003-06-09 10:51:29", NULL, "0", "2003-06-09 10:51:29", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791a14669444553544200", "Level2", "admin", "2003-06-09 10:51:29", NULL, "0", "2003-06-09 10:51:29", "admin", "0", "c373e9f5ad0791a0dab5444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791a23c0e444553544200", "Level3", "admin", "2003-06-09 10:51:29", NULL, "0", "2003-06-09 10:51:29", "admin", "0", "c373e9f5ad0791a14669444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791a6b11f444553544200", "Dir1", "admin", "2003-06-09 10:51:30", NULL, "0", "2003-06-09 10:51:30", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791a897d6444553544200", "Dir2", "admin", "2003-06-09 10:51:30", NULL, "0", "2003-06-09 10:51:30", "admin", "0", "c373e9f5ad0791a6b11f444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791a9a063444553544200", "NewDestDirectory", "admin", "2003-06-09 10:51:31", NULL, "0", "2003-06-09 10:51:31", "admin", "0", "c373e9f5ad0791a897d6444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791aa73e3444553544200", "LevelA", "admin", "2003-06-09 10:51:31", NULL, "0", "2003-06-09 10:51:31", "admin", "0", "c373e9f5ad0791a0dab5444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791ab034b444553544200", "LevelB", "admin", "2003-06-09 10:51:31", NULL, "0", "2003-06-09 10:51:31", "admin", "0", "c373e9f5ad0791aa73e3444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791ac7311444553544200", "LevelC", "admin", "2003-06-09 10:51:32", NULL, "0", "2003-06-09 10:51:32", "admin", "0", "c373e9f5ad0791ab034b444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791ad66cf444553544200", "test2", "admin", "2003-06-09 10:51:32", NULL, "0", "2003-06-09 10:51:32", "admin", "0", "c373e9f5ad0791724315444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791aebd87444553544200", "test3", "admin", "2003-06-09 10:51:33", NULL, "0", "2003-06-09 10:51:33", "admin", "0", "c373e9f5ad0791ad66cf444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0791dbaac4444553544200", "Special Caf<61> Folder", "admin", "2003-06-09 10:51:43", "test folder names with special chars", "0", "2003-06-09 10:51:43", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0796bf913f444553544200", "CopiedFolder", "admin", "2003-06-09 11:09:05", "Movie Reviews", "0", "2003-06-09 11:09:05", "admin", "0", "c373e9f5ad0791a23c0e444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0796c0eca4444553544200", "Movie Reviews", "admin", "2003-06-09 11:09:13", "Movie Reviews", "0", "2003-06-09 11:09:13", "admin", "33", "c373e9f5ad0796bf913f444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad0796d9b895444553544200", "NewBookFolder", "admin", "2003-06-09 11:12:41", "NewBooks - folder", "0", "2003-06-09 11:12:41", "admin", "0", "c373e9f5ad0796c0eca4444553544200", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t3 VALUES("c373e9f5ad079b4c9355444553544200", "CopiedFolder", "admin", "2003-06-09 11:26:34", "Movie Reviews", "0", "2003-06-09 11:26:34", "admin", "0", "2f6161e879db43c1a5b82c21ddc49089", "03eea05112b845949f3fd03278b5fe43", NULL);
INSERT INTO t4 VALUES("340d243c45f111d497b00010a4ef934d", "Document Layout", "The system Document Layouts Document Type", NULL, "2003-06-05 16:30:00", "System", "1");
INSERT INTO t4 VALUES("340d243d45f111d497b00010a4ef934d", "Default", "The default system Document Type", NULL, "2003-06-05 16:30:00", "System", "1");
INSERT INTO t4 VALUES("4d09dd60850711d4998a204c4f4f5020", "__SystemResourceType", "The type for all the uploaded resources", NULL, "2003-06-05 16:30:00", "System", "1");
INSERT INTO t4 VALUES("91d4d595478211d497b40010a4ef934d", "__PmcSystemDefaultType", "The type for all the default available fields", NULL, "2003-06-05 16:30:00", "System", "1");
INSERT INTO t4 VALUES("c373e9f59cf15a59b08a444553544200", "NoFieldDocType", "plain doc type", NULL, "2003-06-06 07:48:40", "admin", NULL);
INSERT INTO t4 VALUES("c373e9f59cf15a5c6a99444553544200", "Movie Review", "This doc type is for movie reviews", "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<props autocheckin=\"false\" autopublish=\"false\" binary=\"choice\" categories=\"none\" cleanup=\"false\" folder=\"none\"><![CDATA[Doc type for cm tests]]></props>\r\n", "2003-06-06 07:48:40", "admin", NULL);
INSERT INTO t4 VALUES("c373e9f59cf15a6116a5444553544200", "Special Doc<6F>u20A4u20A4u0113<31><33><EFBFBD><EFBFBD>u016BType", "test special chars xxx<78> in doc type", NULL, "2003-06-06 07:48:41", "admin", NULL);
INSERT INTO t4 VALUES("c373e9f59cf15a695d47444553544200", "Movie", NULL, NULL, "2003-06-06 07:48:41", "admin", NULL);
INSERT INTO t4 VALUES("c373e9f5ad079174ff17444553544200", "Discussion", NULL, NULL, "2003-06-09 10:51:25", "admin", NULL);
INSERT INTO t4 VALUES("c373e9f5ad0791da7e2b444553544200", "Books", "list of recommended books", "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<props autocheckin=\"false\" autopublish=\"false\" binary=\"choice\" categories=\"none\" cleanup=\"false\" folder=\"none\"><![CDATA[Doc type for cm tests]]><![CDATA[Doc type for book tests]]></props>\r\n", "2003-06-09 10:51:40", "admin", NULL);
ALTER TABLE t2 ADD FOREIGN KEY FK_DCMNTS_DCTYPES ( DOCTYPEID)
REFERENCES t4 (DOCTYPEID );
ALTER TABLE t2 ADD FOREIGN KEY FK_DCMNTS_FLDRS ( FOLDERID)
REFERENCES t3 (FOLDERID );
ALTER TABLE t3 ADD FOREIGN KEY FK_FLDRS_PRNTID ( PARENTID)
REFERENCES t3 (FOLDERID );
SELECT t2.*, t4.DOCTYPENAME, t1.CONTENTSIZE,t1.MIMETYPE FROM t2 INNER JOIN t4 ON t2.DOCTYPEID = t4.DOCTYPEID LEFT OUTER JOIN t1 ON t2.DOCID = t1.DOCID WHERE t2.FOLDERID IN(SELECT t3_a.FOLDERID FROM t3 as t3_a WHERE t3_a.PARENTID IN(SELECT t3_b.FOLDERID FROM t3 as t3_b WHERE t3_b.PARENTID IN(SELECT t3_c.FOLDERID FROM t3 as t3_c WHERE t3_c.PARENTID IN(SELECT t3_d.FOLDERID FROM t3 as t3_d WHERE t3_d.PARENTID IN(SELECT t3_e.FOLDERID FROM t3 as t3_e WHERE t3_e.PARENTID='2f6161e879db43c1a5b82c21ddc49089' AND t3_e.FOLDERNAME = 'Level1') AND t3_d.FOLDERNAME = 'Level2') AND t3_c.FOLDERNAME = 'Level3') AND t3_b.FOLDERNAME = 'CopiedFolder') AND t3_a.FOLDERNAME = 'Movie Reviews') AND t2.DOCNAME = 'Last Discussion';
DOCID DOCNAME DOCTYPEID FOLDERID AUTHOR CREATED TITLE SUBTITLE DOCABSTRACT PUBLISHDATE EXPIRATIONDATE LOCKEDBY STATUS PARENTDOCID REPID MODIFIED MODIFIER PUBLISHSTATUS ORIGINATOR DOCTYPENAME CONTENTSIZE MIMETYPE
c373e9f5ad07993f3859444553544200 Last Discussion c373e9f5ad079174ff17444553544200 c373e9f5ad0796c0eca4444553544200 Goldilocks 2003-06-09 11:21:06 Title: Last Discussion NULL Setting new abstract and keeping doc checked out 2003-06-09 10:51:26 2003-06-09 10:51:26 NULL NULL NULL 03eea05112b845949f3fd03278b5fe43 2003-06-09 11:21:06 admin 0 NULL Discussion NULL NULL
EXPLAIN SELECT t2.*, t4.DOCTYPENAME, t1.CONTENTSIZE,t1.MIMETYPE FROM t2 INNER JOIN t4 ON t2.DOCTYPEID = t4.DOCTYPEID LEFT OUTER JOIN t1 ON t2.DOCID = t1.DOCID WHERE t2.FOLDERID IN(SELECT t3_a.FOLDERID FROM t3 as t3_a WHERE t3_a.PARENTID IN(SELECT t3_b.FOLDERID FROM t3 as t3_b WHERE t3_b.PARENTID IN(SELECT t3_c.FOLDERID FROM t3 as t3_c WHERE t3_c.PARENTID IN(SELECT t3_d.FOLDERID FROM t3 as t3_d WHERE t3_d.PARENTID IN(SELECT t3_e.FOLDERID FROM t3 as t3_e WHERE t3_e.PARENTID='2f6161e879db43c1a5b82c21ddc49089' AND t3_e.FOLDERNAME = 'Level1') AND t3_d.FOLDERNAME = 'Level2') AND t3_c.FOLDERNAME = 'Level3') AND t3_b.FOLDERNAME = 'CopiedFolder') AND t3_a.FOLDERNAME = 'Movie Reviews') AND t2.DOCNAME = 'Last Discussion';
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL DDOCTYPEID_IDX,DFOLDERID_IDX NULL NULL NULL 9 Using where
1 PRIMARY t4 eq_ref PRIMARY PRIMARY 34 test.t2.DOCTYPEID 1
1 PRIMARY t1 eq_ref PRIMARY PRIMARY 34 test.t2.DOCID 1
1 PRIMARY t3_a eq_ref PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX PRIMARY 34 test.t2.FOLDERID 1 Using where
1 PRIMARY t3_b eq_ref PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX PRIMARY 34 test.t3_a.PARENTID 1 Using where
1 PRIMARY t3_c eq_ref PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX PRIMARY 34 test.t3_b.PARENTID 1 Using where
1 PRIMARY t3_d eq_ref PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX PRIMARY 34 test.t3_c.PARENTID 1 Using where
1 PRIMARY t3_e ref|filter PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX FFOLDERID_IDX|CMFLDRPARNT_IDX 34|35 test.t3_d.PARENTID 1 (29%) Using where; Using rowid filter
drop table t1, t2, t3, t4;
CREATE TABLE t1 (a int(10) , PRIMARY KEY (a)) Engine=InnoDB;
INSERT INTO t1 VALUES (1),(2);
CREATE TABLE t2 (a int(10), PRIMARY KEY (a)) Engine=InnoDB;
INSERT INTO t2 VALUES (1);
CREATE TABLE t3 (a int(10), b int(10), c int(10),
PRIMARY KEY (a)) Engine=InnoDB;
INSERT INTO t3 VALUES (1,2,1);
SELECT t1.* FROM t1 WHERE (SELECT COUNT(*) FROM t3,t2 WHERE t3.c=t2.a
and t2.a='1' AND t1.a=t3.b) > 0;
a
2
DROP TABLE t1,t2,t3;
#
# Bug #902356: DISTINCT in materialized subquery
#
CREATE TABLE t1 (pk int PRIMARY KEY, a int, KEY(a)) ENGINE=InnoDB;
INSERT INTO t1 VALUES (0, 4), (8, 6);
CREATE TABLE t2 (pk int PRIMARY KEY, a int, KEY(a)) ENGINE=InnoDB;
INSERT INTO t2 VALUES (0, 4), (8, 6);
CREATE TABLE t3 (b INT, KEY(b));
INSERT INTO t3 VALUES (7), (0), (4), (2);
CREATE VIEW v1 AS SELECT * FROM t1;
SET @tmp_optimizer_switch=@@optimizer_switch;
SET optimizer_switch='materialization=on,in_to_exists=on';
EXPLAIN
SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM t1) OR a = b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 index a a 5 NULL 2 Using where; Using index
1 PRIMARY t3 ref b b 5 test.t2.a 2 Using index
2 SUBQUERY t1 const PRIMARY,a PRIMARY 4 const 1 Using where
SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM t1) OR a = b;
pk a b
0 4 4
EXPLAIN
SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM v1) OR a = b;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 index a a 5 NULL 2 Using where; Using index
1 PRIMARY t3 ref b b 5 test.t2.a 2 Using index
2 SUBQUERY t1 const PRIMARY,a PRIMARY 4 const 1 Using where
SELECT * FROM t2,t3 WHERE (2,9) IN (SELECT DISTINCT a,pk FROM v1) OR a = b;
pk a b
0 4 4
SET optimizer_switch=@tmp_optimizer_switch;
DROP VIEW v1;
DROP TABLE t1,t2,t3;
#
# MDEV-536: LP:1050806 - different result for a query using subquery
#
DROP TABLE IF EXISTS `t1`;
Warnings:
Note 1051 Unknown table 'test.t1'
CREATE TABLE `t1` (
`node_uid` bigint(20) unsigned DEFAULT NULL,
`date` datetime DEFAULT NULL,
`mirror_date` datetime DEFAULT NULL,
KEY `date` (`date`)
) ENGINE=MyISAM;
INSERT INTO `t1` VALUES (2085,'2012-01-01 00:00:00','2013-01-01 00:00:00');
INSERT INTO `t1` VALUES (2084,'2012-02-01 00:00:00','2013-01-01 00:00:00');
INSERT INTO `t1` VALUES (2088,'2012-03-01 00:00:00','2013-01-01 00:00:00');
SELECT * FROM (
SELECT node_uid, date, mirror_date, @result := 0 AS result
FROM t1
WHERE date < '2012-12-12 12:12:12'
AND node_uid in (2085, 2084)
ORDER BY mirror_date ASC
) AS calculated_result;
node_uid date mirror_date result
2085 2012-01-01 00:00:00 2013-01-01 00:00:00 0
2084 2012-02-01 00:00:00 2013-01-01 00:00:00 0
DROP TABLE t1;
#
# MDEV-567: Wrong result from a query with correlated subquery if ICP is allowed
#
CREATE TABLE t1 (a int, b int, INDEX idx(a));
INSERT INTO t1 VALUES (9,0), (7,1), (1,9), (7,3), (2,1);
CREATE TABLE t2 (a int, b int, INDEX idx(a));
INSERT INTO t2 VALUES (2,1), (6,4), (7,6), (9,4);
CREATE TABLE t3 (a int, b int);
INSERT INTO t3 VALUES (1,0), (1,1), (1,3);
SELECT * FROM t3
WHERE a = (SELECT COUNT(DISTINCT t2.b) FROM t1, t2
WHERE t1.a = t2.a AND t2.a BETWEEN 7 AND 9
AND t3.b = t1.b
GROUP BY t1.b);
a b
1 0
1 1
1 3
set @tmp_mdev567=@@optimizer_switch;
set optimizer_switch='mrr=off';
SELECT * FROM t3
WHERE a = (SELECT COUNT(DISTINCT t2.b) FROM t1, t2
WHERE t1.a = t2.a AND t2.a BETWEEN 7 AND 9
AND t3.b = t1.b
GROUP BY t1.b);
a b
1 0
1 1
1 3
DROP TABLE t1,t2,t3;
set optimizer_switch=@tmp_mdev567;
#
# MDEV-4996: degenerate OR formula in WHERE of a subquery
#
CREATE TABLE t1 (a int, c1 varchar(1)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (2,'x'), (8,'d');
CREATE TABLE t2 (m int, n int, c2 varchar(1)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (0, 5, 'x'), (1, 4,'p');
SELECT * FROM t1 WHERE c1 NOT IN (
SELECT t2a.c2 FROM t2 AS t2a, t2 AS t2b, t2 AS t2c
WHERE t2c.c2 = t2b.c2 AND ( t2a.m = t2b.n OR 0 ) AND
( t2b.m != a OR t2b.m = t2a.m ));
a c1
2 x
8 d
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE c1 NOT IN (
SELECT t2a.c2 FROM t2 AS t2a, t2 AS t2b, t2 AS t2c
WHERE t2c.c2 = t2b.c2 AND ( t2a.m = t2b.n OR 0 ) AND
( t2b.m != a OR t2b.m = t2a.m ));
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t2a ALL NULL NULL NULL NULL 2 100.00 Using where
2 DEPENDENT SUBQUERY t2b ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
2 DEPENDENT SUBQUERY t2c ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
Warnings:
Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`c1` AS `c1` from `test`.`t1` where !<expr_cache><`test`.`t1`.`c1`,`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`c1`,<exists>(/* select#2 */ select `test`.`t2a`.`c2` from `test`.`t2` `t2a` join `test`.`t2` `t2b` join `test`.`t2` `t2c` where `test`.`t2c`.`c2` = `test`.`t2b`.`c2` and `test`.`t2b`.`n` = `test`.`t2a`.`m` and (`test`.`t2b`.`m` <> `test`.`t1`.`a` or `test`.`t2b`.`m` = `test`.`t2a`.`m`) and trigcond(<cache>(`test`.`t1`.`c1`) = `test`.`t2a`.`c2` or `test`.`t2a`.`c2` is null) having trigcond(`test`.`t2a`.`c2` is null))))
DROP TABLE t1,t2;
#
# MDEV-614, also MDEV-536, also LP:1050806:
# different result for a query using subquery between 5.5.25 and 5.5.27
#
CREATE TABLE `t1` (
`node_uid` bigint(20) unsigned DEFAULT NULL,
`date` datetime DEFAULT NULL,
`mirror_date` datetime DEFAULT NULL,
KEY `date` (`date`)
) ENGINE=MyISAM;
INSERT INTO `t1` VALUES (2085,'2012-01-01 00:00:00','2013-01-01 00:00:00');
INSERT INTO `t1` VALUES (2084,'2012-02-01 00:00:00','2013-01-01 00:00:00');
INSERT INTO `t1` VALUES (2088,'2012-03-01 00:00:00','2013-01-01 00:00:00');
explain
SELECT * FROM (
SELECT node_uid, date, mirror_date, @result := 0 AS result
FROM t1
WHERE date < '2012-12-12 12:12:12'
AND node_uid in (2085, 2084)
ORDER BY mirror_date ASC
) AS calculated_result;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
2 DERIVED t1 range date date 6 NULL 3 Using index condition; Using where; Rowid-ordered scan; Using filesort
SELECT * FROM (
SELECT node_uid, date, mirror_date, @result := 0 AS result
FROM t1
WHERE date < '2012-12-12 12:12:12'
AND node_uid in (2085, 2084)
ORDER BY mirror_date ASC
) AS calculated_result;
node_uid date mirror_date result
2085 2012-01-01 00:00:00 2013-01-01 00:00:00 0
2084 2012-02-01 00:00:00 2013-01-01 00:00:00 0
set @tmp_mdev614=@@optimizer_switch;
set optimizer_switch='mrr=off';
explain
SELECT * FROM (
SELECT node_uid, date, mirror_date, @result := 0 AS result
FROM t1
WHERE date < '2012-12-12 12:12:12'
AND node_uid in (2085, 2084)
ORDER BY mirror_date ASC
) AS calculated_result;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3
2 DERIVED t1 range date date 6 NULL 3 Using index condition; Using where; Using filesort
SELECT * FROM (
SELECT node_uid, date, mirror_date, @result := 0 AS result
FROM t1
WHERE date < '2012-12-12 12:12:12'
AND node_uid in (2085, 2084)
ORDER BY mirror_date ASC
) AS calculated_result;
node_uid date mirror_date result
2085 2012-01-01 00:00:00 2013-01-01 00:00:00 0
2084 2012-02-01 00:00:00 2013-01-01 00:00:00 0
set optimizer_switch=@tmp_mdev614;
DROP TABLE t1;
#
# MDEV-4420: non-expensive single-value subquery used as
# used as an access key to join a table
#
create table t1 (a varchar(3));
insert into t1 values ('USA'), ('FRA');
create table t2 select * from t1;
insert into t2 values ('RUS');
create table t3 select * from t2;
create index idx on t3(a);
explain extended
select * from t1, t2 left join t3 on ( t2.a = t3.a )
where t1.a = t2.a and ( t1.a = ( select min(a) from t1 ) or 0 );
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
1 PRIMARY t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t3 ref idx idx 6 func 2 100.00 Using where; Using index
2 SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`a` AS `a`,`test`.`t3`.`a` AS `a` from `test`.`t1` join `test`.`t2` left join `test`.`t3` on(`test`.`t3`.`a` = `test`.`t1`.`a`) where `test`.`t1`.`a` = (/* select#2 */ select min(`test`.`t1`.`a`) from `test`.`t1`) and `test`.`t2`.`a` = (/* select#2 */ select min(`test`.`t1`.`a`) from `test`.`t1`)
select * from t1, t2 left join t3 on ( t2.a = t3.a )
where t1.a = t2.a and ( t1.a = ( select min(a) from t1 ) or 0 );
a a a
FRA FRA FRA
drop table t1,t2,t3;
#
# MDEV-10148: Database crashes in the query to the View
#
CREATE TABLE t1 (
key_code INT(11) NOT NULL,
value_string VARCHAR(50) NULL DEFAULT NULL,
PRIMARY KEY (key_code)
) COLLATE='utf8_general_ci' ENGINE=InnoDB ;
CREATE TABLE t2 (
key_code INT(11) NOT NULL,
target_date DATE NULL DEFAULT NULL,
PRIMARY KEY (key_code)
) COLLATE='utf8_general_ci' ENGINE=InnoDB ;
CREATE TABLE t3 (
now_date DATE NOT NULL,
PRIMARY KEY (now_date)
) COLLATE='utf8_general_ci' ENGINE=InnoDB ;
CREATE VIEW v1
AS
SELECT
B.key_code,
B.target_date
FROM
t2 B INNER JOIN t3 C ON
B.target_date = C.now_date
;
SET @s = 'SELECT A.* FROM t1 A WHERE A.key_code IN (SELECT key_code FROM v1)';
PREPARE stmt FROM @s;
EXECUTE stmt;
key_code value_string
EXECUTE stmt;
key_code value_string
DEALLOCATE PREPARE stmt;
DROP VIEW v1;
DROP TABLE t1,t2,t3;
set optimizer_switch=@save_optimizer_switch;
create table t1 (a int);
create table t2 (a int);
create table t3(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
insert into t2 select a from t1;
insert into t3 select a from t1;
select null in (select a from t1 where a < out3.a union select a from t2 where
(select a from t3) +1 < out3.a+1) from t3 out3;
ERROR 21000: Subquery returns more than 1 row
drop table t1, t2, t3;
CREATE TABLE t1(
q11 int, q12 int, q13 int, q14 int, q15 int, q16 int, q17 int, q18 int, q19 int,
q21 int, q22 int, q23 int, q24 int, q25 int, q26 int, q27 int, q28 int, q29 int,
f1 int
);
CREATE TABLE t2(f2 int, f21 int, f3 timestamp, f4 int, f5 int, f6 int);
INSERT INTO t1 (f1) VALUES (1),(1),(2),(2);
INSERT INTO t2 VALUES (1,1,"2004-02-29 11:11:11",0,0,0), (2,2,"2004-02-29 11:11:11",0,0,0);
SELECT f1,
(SELECT t.f21 from t2 t where max(
q11+q12+q13+q14+q15+q16+q17+q18+q19+
q21+q22+q23+q24+q25+q26+q27+q28+q29) = t.f2 UNION
SELECT t.f3 FROM t2 AS t WHERE t1.f1=t.f2 AND t.f3=MAX(t1.f1) UNION
SELECT 1 LIMIT 1) AS test
FROM t1 GROUP BY f1;
f1 test
1 1
2 1
Warnings:
Warning 1292 Truncated incorrect datetime value: '1'
Warning 1292 Truncated incorrect datetime value: '2'
DROP TABLE t1,t2;
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