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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.
123 lines
3.4 KiB
Plaintext
123 lines
3.4 KiB
Plaintext
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 ( number INT NOT NULL, alpha CHAR(6) NOT NULL );
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INSERT INTO t1 VALUES (1413006,'idlfmv'),
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(1413065,'smpsfz'),(1413127,'sljrhx'),(1413304,'qerfnd');
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SELECT number, alpha, CONCAT_WS('<---->',number,alpha) AS new
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FROM t1 GROUP BY number;
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number alpha new
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1413006 idlfmv 1413006<---->idlfmv
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1413065 smpsfz 1413065<---->smpsfz
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1413127 sljrhx 1413127<---->sljrhx
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1413304 qerfnd 1413304<---->qerfnd
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SELECT CONCAT_WS('<---->',number,alpha) AS new
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FROM t1 GROUP BY new LIMIT 1;
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new
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1413006<---->idlfmv
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SELECT number, alpha, CONCAT_WS('<->',number,alpha) AS new
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FROM t1 GROUP BY new LIMIT 1;
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number alpha new
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1413006 idlfmv 1413006<->idlfmv
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SELECT number, alpha, CONCAT_WS('-',number,alpha,alpha,alpha,alpha,alpha,alpha,alpha) AS new
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FROM t1 GROUP BY new LIMIT 1;
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number alpha new
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1413006 idlfmv 1413006-idlfmv-idlfmv-idlfmv-idlfmv-idlfmv-idlfmv-idlfmv
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SELECT number, alpha, CONCAT_WS('<------------------>',number,alpha) AS new
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FROM t1 GROUP BY new LIMIT 1;
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number alpha new
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1413006 idlfmv 1413006<------------------>idlfmv
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drop table t1;
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create table t1 (a char(4), b double, c date, d tinyint(4));
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insert into t1 values ('AAAA', 105, '2003-03-01', 1);
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select * from t1 where concat(A,C,B,D) = 'AAAA2003-03-011051';
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a b c d
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AAAA 105 2003-03-01 1
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drop table t1;
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select 'a' union select concat('a', -4);
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a
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a
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a-4
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select 'a' union select concat('a', -4.5);
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a
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a
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a-4.5
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select 'a' union select concat('a', -(4 + 1));
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a
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a
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a-5
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select 'a' union select concat('a', 4 - 5);
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a
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a
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a-1
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select 'a' union select concat('a', -'3');
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a
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a
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a-3
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select 'a' union select concat('a', -concat('3',4));
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a
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a
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a-34
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select 'a' union select concat('a', -0);
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a
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a
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a0
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select 'a' union select concat('a', -0.0);
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a
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a
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a0.0
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select 'a' union select concat('a', -0.0000);
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a
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a
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a0.0000
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select concat((select x from (select 'a' as x) as t1 ),
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(select y from (select 'b' as y) as t2 )) from (select 1 union select 2 )
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as t3;
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concat((select x from (select 'a' as x) as t1 ),
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(select y from (select 'b' as y) as t2 ))
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ab
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ab
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create table t1(f1 varchar(6)) charset=utf8;
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insert into t1 values ("123456");
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select concat(f1, 2) a from t1 union select 'x' a from t1;
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a
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1234562
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x
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drop table t1;
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CREATE TABLE t1 (c1 varchar(100), c2 varchar(100));
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INSERT INTO t1 VALUES ('',''), ('','First'), ('Random','Random');
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SELECT * FROM t1 WHERE CONCAT(c1,' ',c2) REGEXP 'First.*';
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c1 c2
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First
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DROP TABLE t1;
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# End of 5.0 tests
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#
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# Bug #44743: Join in combination with concat does not always work
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#
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CREATE TABLE t1 (
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a VARCHAR(100) NOT NULL DEFAULT '0',
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b VARCHAR(2) NOT NULL DEFAULT '',
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c VARCHAR(2) NOT NULL DEFAULT '',
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d TEXT NOT NULL,
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PRIMARY KEY (a, b, c),
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KEY (a)
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) DEFAULT CHARSET=utf8;
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INSERT INTO t1 VALUES ('gui_A', 'a', 'b', 'str1'),
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('gui_AB', 'a', 'b', 'str2'), ('gui_ABC', 'a', 'b', 'str3');
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CREATE TABLE t2 (
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a VARCHAR(100) NOT NULL DEFAULT '',
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PRIMARY KEY (a)
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) DEFAULT CHARSET=latin1;
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INSERT INTO t2 VALUES ('A'), ('AB'), ('ABC');
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SELECT CONCAT('gui_', t2.a), t1.d FROM t2
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LEFT JOIN t1 ON t1.a = CONCAT('gui_', t2.a) AND t1.b = 'a' AND t1.c = 'b';
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CONCAT('gui_', t2.a) d
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gui_A str1
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gui_AB str2
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gui_ABC str3
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EXPLAIN SELECT CONCAT('gui_', t2.a), t1.d FROM t2
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LEFT JOIN t1 ON t1.a = CONCAT('gui_', t2.a) AND t1.b = 'a' AND t1.c = 'b';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 index NULL PRIMARY 102 NULL 3 Using index
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1 SIMPLE t1 eq_ref PRIMARY,a PRIMARY 318 func,const,const 1 Using where
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DROP TABLE t1, t2;
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# End of 5.1 tests
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