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IF(..., CAST(longtext AS UNSIGNED), signed_val) (was: LEFT JOIN on inline view crashes server) Select from a LONGTEXT column wrapped with an expression like "IF(..., CAST(longtext_column AS UNSIGNED), smth_signed)" failed an assertion or crashed the server. IFNULL function was affected too. LONGTEXT column item has a maximum length of 32^2-1 bytes, at the same time this is a maximum possible length of any MySQL item. CAST(longtext_column AS UNSIGNED) returns some unsigned numeric result of length 32^2-1, so the result of IF/IFNULL function of this number and some other signed number will have text length of (32^2-1)+1=32^2 (one byte for the minus sign) - there is integer overflow, and the length is equal to zero. That caused assert/crash. CAST AS UNSIGNED function has been modified to limit maximal length of resulting number to 67 (maximal length of DECIMAL and two characters for minus sign and dot). mysql-test/r/func_if.result: Added test case for bug #40761. mysql-test/t/func_if.test: Added test case for bug #40761. sql/item_func.h: Bug #40761: Assert on sum function on IF(..., CAST(longtext AS UNSIGNED), signed_val) CAST AS UNSIGNED function has been modified to limit maximal length of resulting number to 67 (maximal length of DECIMAL and two characters for minus sign and dot).
188 lines
5.1 KiB
Text
188 lines
5.1 KiB
Text
drop table if exists t1;
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select IF(0,"ERROR","this"),IF(1,"is","ERROR"),IF(NULL,"ERROR","a"),IF(1,2,3)|0,IF(1,2.0,3.0)+0 ;
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IF(0,"ERROR","this") IF(1,"is","ERROR") IF(NULL,"ERROR","a") IF(1,2,3)|0 IF(1,2.0,3.0)+0
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this is a 2 2.0
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CREATE TABLE t1 (st varchar(255) NOT NULL, u int(11) NOT NULL) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('a',1),('A',1),('aa',1),('AA',1),('a',1),('aaa',0),('BBB',0);
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select if(1,st,st) s from t1 order by s;
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s
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a
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A
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a
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aa
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AA
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aaa
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BBB
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select if(u=1,st,st) s from t1 order by s;
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s
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a
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A
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a
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aa
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AA
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aaa
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BBB
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select if(u=1,binary st,st) s from t1 order by s;
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s
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A
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AA
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BBB
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a
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a
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aa
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aaa
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select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;
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s
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A
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AA
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a
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a
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aa
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aaa
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explain extended select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where; Using filesort
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Warnings:
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Note 1003 select if((`test`.`t1`.`u` = 1),`test`.`t1`.`st`,cast(`test`.`t1`.`st` as char charset binary)) AS `s` from `test`.`t1` where (`test`.`t1`.`st` like _latin1'%a%') order by if((`test`.`t1`.`u` = 1),`test`.`t1`.`st`,cast(`test`.`t1`.`st` as char charset binary))
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select nullif(u, 1) from t1;
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nullif(u, 1)
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NULL
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NULL
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NULL
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NULL
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NULL
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0
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0
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explain extended select nullif(u, 1) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 7
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Warnings:
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Note 1003 select nullif(`test`.`t1`.`u`,1) AS `nullif(u, 1)` from `test`.`t1`
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drop table t1;
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select nullif(1,'test');
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nullif(1,'test')
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1
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Warnings:
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Warning 1292 Truncated incorrect DOUBLE value: 'test'
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select NULLIF(NULL,NULL), NULLIF(NULL,1), NULLIF(NULL,1.0), NULLIF(NULL,"test");
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NULLIF(NULL,NULL) NULLIF(NULL,1) NULLIF(NULL,1.0) NULLIF(NULL,"test")
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NULL NULL NULL NULL
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select NULLIF(1,NULL), NULLIF(1.0, NULL), NULLIF("test", NULL);
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NULLIF(1,NULL) NULLIF(1.0, NULL) NULLIF("test", NULL)
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1 1.0 test
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create table t1 (num double(12,2));
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insert into t1 values (144.54);
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select sum(if(num is null,0.00,num)) from t1;
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sum(if(num is null,0.00,num))
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144.54
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drop table t1;
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create table t1 (x int, y int);
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insert into t1 values (0,6),(10,16),(20,26),(30,10),(40,46),(50,56);
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select min(if(y -x > 5,y,NULL)), max(if(y - x > 5,y,NULL)) from t1;
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min(if(y -x > 5,y,NULL)) max(if(y - x > 5,y,NULL))
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6 56
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drop table t1;
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create table t1 (a int);
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insert t1 values (1),(2);
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select if(1>2,a,avg(a)) from t1;
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if(1>2,a,avg(a))
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1.5000
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drop table t1;
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SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;
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NULLIF(5,5) IS NULL NULLIF(5,5) IS NOT NULL
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1 0
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CREATE TABLE `t1` (
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`id` int(11) NOT NULL ,
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`date` int(10) default NULL,
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`text` varchar(32) NOT NULL
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);
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INSERT INTO t1 VALUES (1,1110000000,'Day 1'),(2,1111000000,'Day 2'),(3,1112000000,'Day 3');
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SELECT id, IF(date IS NULL, '-', FROM_UNIXTIME(date, '%d-%m-%Y')) AS date_ord, text FROM t1 ORDER BY date_ord ASC;
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id date_ord text
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1 05-03-2005 Day 1
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2 16-03-2005 Day 2
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3 28-03-2005 Day 3
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SELECT id, IF(date IS NULL, '-', FROM_UNIXTIME(date, '%d-%m-%Y')) AS date_ord, text FROM t1 ORDER BY date_ord DESC;
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id date_ord text
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3 28-03-2005 Day 3
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2 16-03-2005 Day 2
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1 05-03-2005 Day 1
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DROP TABLE t1;
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CREATE TABLE t1 (a CHAR(10));
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INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
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SELECT a, NULLIF(a,'') FROM t1;
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a NULLIF(a,'')
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aaa aaa
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NULL NULL
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NULL
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bbb bbb
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SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
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a NULLIF(a,'')
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NULL NULL
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NULL
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DROP TABLE t1;
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create table t1 (f1 int, f2 int);
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insert into t1 values(1,1),(0,0);
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select f1, f2, if(f1, 40.0, 5.00) from t1 group by f1 order by f2;
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f1 f2 if(f1, 40.0, 5.00)
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0 0 5.00
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1 1 40.00
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drop table t1;
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select if(0, 18446744073709551610, 18446744073709551610);
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if(0, 18446744073709551610, 18446744073709551610)
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18446744073709551610
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CREATE TABLE t1(a DECIMAL(10,3));
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SELECT t1.a,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,0)))))))))))))))))))))))))))))) + 1
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FROM t1;
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a IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((R
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DROP TABLE t1;
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CREATE TABLE t1 (c LONGTEXT);
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INSERT INTO t1 VALUES(1), (2), (3), (4), ('12345678901234567890');
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SELECT * FROM (SELECT MAX(IF(1, CAST(c AS UNSIGNED), 0)) FROM t1) AS te;
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MAX(IF(1, CAST(c AS UNSIGNED), 0))
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12345678901234567890
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SELECT * FROM (SELECT MAX(IFNULL(CAST(c AS UNSIGNED), 0)) FROM t1) AS te;
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MAX(IFNULL(CAST(c AS UNSIGNED), 0))
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12345678901234567890
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DROP TABLE t1;
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End of 5.0 tests
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