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The IN() function uses agg_cmp_type() to aggregate all types of its arguments to find out some common type for comparisons. In this particular case the char() and the int was aggregated to double because char() can contain values like '1.5'. But all strings which do not start from a digit are converted to 0. thus 'a' and 'z' become equal. This behaviour is reasonable when all function arguments are constants. But when there is a field or an expression this can lead to false comparisons. In this case it makes more sense to coerce constants to the type of the field argument. The agg_cmp_type() function now aggregates types of constant and non-constant items separately. If some non-constant items will be found then their aggregated type will be returned. Thus after the aggregation constants will be coerced to the aggregated type.
124 lines
3.6 KiB
Text
124 lines
3.6 KiB
Text
# Initialise
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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#
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# test of IN (NULL)
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#
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select 1 in (1,2,3);
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select 10 in (1,2,3);
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select NULL in (1,2,3);
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select 1 in (1,NULL,3);
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select 3 in (1,NULL,3);
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select 10 in (1,NULL,3);
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select 1.5 in (1.5,2.5,3.5);
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select 10.5 in (1.5,2.5,3.5);
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select NULL in (1.5,2.5,3.5);
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select 1.5 in (1.5,NULL,3.5);
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select 3.5 in (1.5,NULL,3.5);
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select 10.5 in (1.5,NULL,3.5);
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CREATE TABLE t1 (a int, b int, c int);
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insert into t1 values (1,2,3), (1,NULL,3);
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select 1 in (a,b,c) from t1;
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select 3 in (a,b,c) from t1;
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select 10 in (a,b,c) from t1;
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select NULL in (a,b,c) from t1;
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drop table t1;
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CREATE TABLE t1 (a float, b float, c float);
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insert into t1 values (1.5,2.5,3.5), (1.5,NULL,3.5);
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select 1.5 in (a,b,c) from t1;
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select 3.5 in (a,b,c) from t1;
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select 10.5 in (a,b,c) from t1;
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drop table t1;
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CREATE TABLE t1 (a varchar(10), b varchar(10), c varchar(10));
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insert into t1 values ('A','BC','EFD'), ('A',NULL,'EFD');
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select 'A' in (a,b,c) from t1;
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select 'EFD' in (a,b,c) from t1;
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select 'XSFGGHF' in (a,b,c) from t1;
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drop table t1;
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CREATE TABLE t1 (field char(1));
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INSERT INTO t1 VALUES ('A'),(NULL);
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SELECT * from t1 WHERE field IN (NULL);
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SELECT * from t1 WHERE field NOT IN (NULL);
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SELECT * from t1 where field = field;
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SELECT * from t1 where field <=> field;
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DELETE FROM t1 WHERE field NOT IN (NULL);
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SELECT * FROM t1;
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drop table t1;
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create table t1 (id int(10) primary key);
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insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9);
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select * from t1 where id in (2,5,9);
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drop table t1;
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create table t1 (
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a char(1) character set latin1 collate latin1_general_ci,
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b char(1) character set latin1 collate latin1_swedish_ci,
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c char(1) character set latin1 collate latin1_danish_ci
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);
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insert into t1 values ('A','B','C');
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insert into t1 values ('a','c','c');
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--error 1267
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select * from t1 where a in (b);
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--error 1270
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select * from t1 where a in (b,c);
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--error 1271
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select * from t1 where 'a' in (a,b,c);
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select * from t1 where 'a' in (a);
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select * from t1 where a in ('a');
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select * from t1 where 'a' collate latin1_general_ci in (a,b,c);
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select * from t1 where 'a' collate latin1_bin in (a,b,c);
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select * from t1 where 'a' in (a,b,c collate latin1_bin);
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explain extended select * from t1 where 'a' in (a,b,c collate latin1_bin);
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drop table t1;
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set names utf8;
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create table t1 (a char(10) character set utf8 not null);
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insert into t1 values ('bbbb'),(_koi8r'<27><><EFBFBD><EFBFBD>'),(_latin1'<27><><EFBFBD><EFBFBD>');
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select a from t1 where a in ('bbbb',_koi8r'<27><><EFBFBD><EFBFBD>',_latin1'<27><><EFBFBD><EFBFBD>') order by a;
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drop table t1;
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# Bug#7834 Illegal mix of collations in IN operator
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create table t1 (a char(10) character set latin1 not null);
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insert into t1 values ('a'),('b'),('c');
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select a from t1 where a IN ('a','b','c') order by a;
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drop table t1;
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set names latin1;
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select '1.0' in (1,2);
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select 1 in ('1.0',2);
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select 1 in (1,'2.0');
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select 1 in ('1.0',2.0);
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select 1 in (1.0,'2.0');
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select 1 in ('1.1',2);
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select 1 in ('1.1',2.0);
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# Test case for bug #6365
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create table t1 (a char(20) character set binary);
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insert into t1 values ('aa'), ('bb');
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select * from t1 where a in (NULL, 'aa');
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drop table t1;
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# BUG#13419
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create table t1 (id int, key(id));
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insert into t1 values (1),(2),(3);
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select count(*) from t1 where id not in (1);
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select count(*) from t1 where id not in (1,2);
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drop table t1;
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#
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# Bug#18360 Incorrect type coercion in IN() results in false comparison
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#
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create table t1 (f1 char(1), f2 int);
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insert into t1 values (1,0),('a',1),('z',2);
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select f1 from t1 where f1 in (1,'z');
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select f2 from t1 where f2 in (1,'z');
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select f1 from t1 where 'z' in (1,f1);
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select * from t1 where 'z' in (f2,f1);
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select * from t1 where 1 in (f2,f1);
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drop table t1;
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# End of 4.1 tests
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