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MDEV-536: LP:1050806 - different result for a query using subquery, and
MDEV-567: Wrong result from a query with correlated subquery if ICP is allowed: backport the fix developed for SHOW EXPLAIN: revision-id: psergey@askmonty.org-20120719115219-212cxmm6qvf0wlrb branch nick: 5.5-show-explain-r21 timestamp: Thu 2012-07-19 15:52:19 +0400 BUG#992942 & MDEV-325: Pre-liminary commit for testing and adjust it so that it handles DS-MRR scans correctly.
This commit is contained in:
Sergey Petrunya
@@ -180,6 +180,32 @@ SET optimizer_switch=@tmp_optimizer_switch;
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DROP VIEW v1;
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DROP TABLE t1,t2,t3;
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#
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# MDEV-536: LP:1050806 - different result for a query using subquery
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#
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DROP TABLE IF EXISTS `t1`;
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Warnings:
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Note 1051 Unknown table 't1'
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CREATE TABLE `t1` (
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`node_uid` bigint(20) unsigned DEFAULT NULL,
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`date` datetime DEFAULT NULL,
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`mirror_date` datetime DEFAULT NULL,
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KEY `date` (`date`)
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) ENGINE=MyISAM;
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INSERT INTO `t1` VALUES (2085,'2012-01-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2084,'2012-02-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2088,'2012-03-01 00:00:00','2013-01-01 00:00:00');
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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node_uid date mirror_date result
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2085 2012-01-01 00:00:00 2013-01-01 00:00:00 0
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2084 2012-02-01 00:00:00 2013-01-01 00:00:00 0
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DROP TABLE t1;
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#
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# MDEV-567: Wrong result from a query with correlated subquery if ICP is allowed
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#
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CREATE TABLE t1 (a int, b int, INDEX idx(a));
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@@ -197,5 +223,76 @@ a b
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1 0
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1 1
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1 3
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DROP TABLE t1, t2, t3;
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set @tmp_mdev567=@@optimizer_switch;
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set optimizer_switch='mrr=off';
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SELECT * FROM t3
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WHERE a = (SELECT COUNT(DISTINCT t2.b) FROM t1, t2
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WHERE t1.a = t2.a AND t2.a BETWEEN 7 AND 9
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AND t3.b = t1.b
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GROUP BY t1.b);
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a b
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1 0
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1 1
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1 3
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DROP TABLE t1,t2,t3;
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set optimizer_switch=@tmp_mdev567;
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#
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# MDEV-614, also MDEV-536, also LP:1050806:
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# different result for a query using subquery between 5.5.25 and 5.5.27
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#
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CREATE TABLE `t1` (
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`node_uid` bigint(20) unsigned DEFAULT NULL,
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`date` datetime DEFAULT NULL,
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`mirror_date` datetime DEFAULT NULL,
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KEY `date` (`date`)
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) ENGINE=MyISAM;
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INSERT INTO `t1` VALUES (2085,'2012-01-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2084,'2012-02-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2088,'2012-03-01 00:00:00','2013-01-01 00:00:00');
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explain
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE <derived2> ALL NULL NULL NULL NULL 2
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2 DERIVED t1 range date date 9 NULL 2 Using index condition; Using where; Rowid-ordered scan; Using filesort
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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node_uid date mirror_date result
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2085 2012-01-01 00:00:00 2013-01-01 00:00:00 0
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2084 2012-02-01 00:00:00 2013-01-01 00:00:00 0
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set @tmp_mdev614=@@optimizer_switch;
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set optimizer_switch='mrr=off';
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explain
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE <derived2> ALL NULL NULL NULL NULL 2
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2 DERIVED t1 range date date 9 NULL 2 Using index condition; Using where; Using filesort
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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node_uid date mirror_date result
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2085 2012-01-01 00:00:00 2013-01-01 00:00:00 0
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2084 2012-02-01 00:00:00 2013-01-01 00:00:00 0
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set optimizer_switch=@tmp_mdev614;
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DROP TABLE t1;
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set optimizer_switch=@subselect2_test_tmp;
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@@ -203,6 +203,32 @@ SET optimizer_switch=@tmp_optimizer_switch;
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DROP VIEW v1;
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DROP TABLE t1,t2,t3;
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--echo #
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--echo # MDEV-536: LP:1050806 - different result for a query using subquery
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--echo #
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DROP TABLE IF EXISTS `t1`;
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CREATE TABLE `t1` (
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`node_uid` bigint(20) unsigned DEFAULT NULL,
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`date` datetime DEFAULT NULL,
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`mirror_date` datetime DEFAULT NULL,
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KEY `date` (`date`)
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) ENGINE=MyISAM;
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INSERT INTO `t1` VALUES (2085,'2012-01-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2084,'2012-02-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2088,'2012-03-01 00:00:00','2013-01-01 00:00:00');
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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DROP TABLE t1;
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--echo #
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--echo # MDEV-567: Wrong result from a query with correlated subquery if ICP is allowed
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--echo #
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@@ -220,7 +246,75 @@ SELECT * FROM t3
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WHERE t1.a = t2.a AND t2.a BETWEEN 7 AND 9
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AND t3.b = t1.b
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GROUP BY t1.b);
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DROP TABLE t1, t2, t3;
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set @tmp_mdev567=@@optimizer_switch;
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set optimizer_switch='mrr=off';
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SELECT * FROM t3
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WHERE a = (SELECT COUNT(DISTINCT t2.b) FROM t1, t2
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WHERE t1.a = t2.a AND t2.a BETWEEN 7 AND 9
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AND t3.b = t1.b
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GROUP BY t1.b);
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DROP TABLE t1,t2,t3;
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set optimizer_switch=@tmp_mdev567;
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--echo #
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--echo # MDEV-614, also MDEV-536, also LP:1050806:
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--echo # different result for a query using subquery between 5.5.25 and 5.5.27
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--echo #
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CREATE TABLE `t1` (
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`node_uid` bigint(20) unsigned DEFAULT NULL,
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`date` datetime DEFAULT NULL,
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`mirror_date` datetime DEFAULT NULL,
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KEY `date` (`date`)
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) ENGINE=MyISAM;
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INSERT INTO `t1` VALUES (2085,'2012-01-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2084,'2012-02-01 00:00:00','2013-01-01 00:00:00');
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INSERT INTO `t1` VALUES (2088,'2012-03-01 00:00:00','2013-01-01 00:00:00');
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explain
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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set @tmp_mdev614=@@optimizer_switch;
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set optimizer_switch='mrr=off';
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explain
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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SELECT * FROM (
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SELECT node_uid, date, mirror_date, @result := 0 AS result
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FROM t1
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WHERE date < '2012-12-12 12:12:12'
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AND node_uid in (2085, 2084)
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ORDER BY mirror_date ASC
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) AS calculated_result;
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set optimizer_switch=@tmp_mdev614;
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DROP TABLE t1;
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set optimizer_switch=@subselect2_test_tmp;
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