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96e092dc73
WL#2474 "Multi Range Read: Change the default MRR implementation to implement new MRR interface"
WL#2475 "Batched range read functions for MyISAM/InnoDb"
"Index condition pushdown for MyISAM/InnoDB"
Igor's fix from sp1r-igor@olga.mysql.com-20080330055902-07614:
There could be observed the following problems:
1. EXPLAIN did not mention pushdown conditions from on expressions in the
'extra' column. As a result if a query had no where conditions pushed
down to a table, but had on conditions pushed to this table the 'extra'
column in the EXPLAIN for the table missed 'using where'.
2. Conditions for ref access were not eliminated from on expressions
though such conditions were eliminated from the where condition.
99 lines
2.7 KiB
Text
99 lines
2.7 KiB
Text
#
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# MRR/MyISAM tests.
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#
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--disable_warnings
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drop table if exists t1, t2, t3;
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--enable_warnings
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set @read_rnd_buffer_size_save= @@read_rnd_buffer_size;
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set read_rnd_buffer_size=79;
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select @@read_rnd_buffer_size;
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-- source include/mrr_tests.inc
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set @@read_rnd_buffer_size= @read_rnd_buffer_size_save;
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#
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# BUG#30622: Incorrect query results for MRR + filesort
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#
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CREATE TABLE t1 (
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ID int(10) unsigned NOT NULL AUTO_INCREMENT,
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col1 int(10) unsigned DEFAULT NULL,
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key1 int(10) unsigned NOT NULL DEFAULT '0',
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key2 int(10) unsigned DEFAULT NULL,
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text1 text,
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text2 text,
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col2 smallint(6) DEFAULT '100',
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col3 enum('headers','bodyandsubject') NOT NULL DEFAULT 'bodyandsubject',
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col4 tinyint(3) unsigned NOT NULL DEFAULT '0',
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PRIMARY KEY (ID),
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KEY (key1),
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KEY (key2)
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) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
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INSERT INTO t1 VALUES
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(1,NULL,1130,NULL,'Hello',NULL,100,'bodyandsubject',0),
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(2,NULL,1130,NULL,'bye',NULL,100,'bodyandsubject',0),
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(3,NULL,1130,NULL,'red',NULL,100,'bodyandsubject',0),
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(4,NULL,1130,NULL,'yellow',NULL,100,'bodyandsubject',0),
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(5,NULL,1130,NULL,'blue',NULL,100,'bodyandsubject',0);
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select * FROM t1 WHERE key1=1130 AND col1 IS NULL ORDER BY text1;
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drop table t1;
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--echo
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--echo BUG#37851: Crash in test_if_skip_sort_order tab->select is zero
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--echo
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CREATE TABLE t1 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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PRIMARY KEY (pk)
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);
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INSERT INTO t1 VALUES (1);
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CREATE TABLE t2 (
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pk int(11) NOT NULL AUTO_INCREMENT,
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int_key int(11) DEFAULT NULL,
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PRIMARY KEY (pk),
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KEY int_key (int_key)
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);
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INSERT INTO t2 VALUES (1,1),(2,6),(3,0);
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EXPLAIN EXTENDED
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SELECT MIN(t1.pk)
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FROM t1 WHERE EXISTS (
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SELECT t2.pk
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FROM t2
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WHERE t2.int_key IS NULL
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GROUP BY t2.pk
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);
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DROP TABLE t1, t2;
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-- echo #
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-- echo # BUG#42048 Discrepancy between MyISAM and Maria's ICP implementation
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-- echo #
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, b char(20), filler char(200), key(a,b(10)));
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insert into t1 select A.a + 10*(B.a + 10*C.a), 'bbb','filler' from t0 A, t0 B, t0 C;
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update t1 set b=repeat(char(65+a), 20) where a < 25;
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--echo This must show range + using index condition:
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explain select * from t1 where a < 10 and b = repeat(char(65+a), 20);
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select * from t1 where a < 10 and b = repeat(char(65+a), 20);
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drop table t0,t1;
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-- echo #
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-- echo # BUG#41136: ORDER BY + range access: EXPLAIN shows "Using MRR" while MRR is actually not used
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-- echo #
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, b int, key(a));
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insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C;
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-- echo This mustn't show "Using MRR":
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explain select * from t1 where a < 20 order by a;
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drop table t0, t1;
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