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Bug#15949 union + illegal mix of collations (IMPLICIT + COERCIBLE)

Browse Source 
union.result, union.test:
  Adding test case.
item.cc:
  Allow safe character set conversion in UNION
  - string constant to column's charset
  - to unicode
  Thus, UNION now works the same with CONCAT (and other string functions)
  in respect of aggregating arguments with different character sets.
This commit is contained in:
bar@mysql.com
2006-03-01 17:58:01 +04:00
parent e75a62aeae
commit a6973ceed0
3 changed files with 22 additions and 3 deletions
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12
mysql-test/r/union.result
View File

@ -1185,6 +1185,16 @@ select concat('value is: ', @val) union select 'some text';
concat('value is: ', @val)
value is: 6
some text
select concat(_latin1'a', _ascii'b' collate ascii_bin);
concat(_latin1'a', _ascii'b' collate ascii_bin)
ab
create table t1 (foo varchar(100)) collate ascii_bin;
insert into t1 (foo) values ("foo");
select foo from t1 union select 'bar' as foo from dual;
foo
foo
bar
drop table t1;
CREATE TABLE t1 (
a ENUM('<27>','<27>','<27>') character set utf8 not null default '<27>',
b ENUM("one", "two") character set utf8,
@ -1214,7 +1224,7 @@ Field Type Null Key Default Extra
a char(1)
drop table t2;
create table t2 select a from t1 union select c from t1;
ERROR HY000: Illegal mix of collations (utf8_general_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation 'UNION'
drop table t2;
create table t2 select a from t1 union select b from t1;
show columns from t2;
Field Type Null Key Default Extra

11
mysql-test/t/union.test
View File

@ -710,6 +710,15 @@ drop table t1;
set @val:=6;
select concat('value is: ', @val) union select 'some text';
#
# Bug#15949 union + illegal mix of collations (IMPLICIT + COERCIBLE)
#
select concat(_latin1'a', _ascii'b' collate ascii_bin);
create table t1 (foo varchar(100)) collate ascii_bin;
insert into t1 (foo) values ("foo");
select foo from t1 union select 'bar' as foo from dual;
drop table t1;
#
# Enum merging test
#
@ -729,8 +738,8 @@ drop table t2;
create table t2 select a from t1 union select a from t1;
show columns from t2;
drop table t2;
-- error 1267
create table t2 select a from t1 union select c from t1;
drop table t2;
create table t2 select a from t1 union select b from t1;
show columns from t2;
drop table t2, t1;

2
sql/item.cc
View File

@ -3258,7 +3258,7 @@ bool Item_type_holder::join_types(THD *thd, Item *item)
const char *old_cs, *old_derivation;
old_cs= collation.collation->name;
old_derivation= collation.derivation_name();
if (collation.aggregate(item->collation))
if (collation.aggregate(item->collation, MY_COLL_ALLOW_CONV))
{
my_error(ER_CANT_AGGREGATE_2COLLATIONS, MYF(0),
old_cs, old_derivation,