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66367aeea8
with previous rows.
The WHERE clause containing expression:
CONCAT(empty_field1, empty_field2, ..., 'literal constant', ...)
REGEXP 'regular expression'
may return wrong matches.
Optimization of the CONCAT function has been fixed.
mysql-test/r/func_concat.result:
Added test case for bug #36488.
mysql-test/t/func_concat.test:
Added test case for bug #36488.
sql/item_strfunc.cc:
Fixed bug #36488.
The Item_func_concat::val_str method is optimized to
use first non-empty argument of the CONCAT function for in-place
result accumulation. This optimization is acceptable if that
first argument is not a constant.
However, current implementation checks this condition only for
the first actual argument of the CONCAT function.
So, the Item_func_concat::val_str method can corrupt values
of, for example, literal strings by appending random data.
The Item_func_concat::val_str method has been modified to take
into account the ability to be modified in-place for the first
non-empty argument.
92 lines
2.3 KiB
Plaintext
92 lines
2.3 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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