Bug#10446 Illegal mix of collations:

item_strfunc.h, item_strfunc.cc, item.cc:
  Try to convert a const item into destination 
  character set. If conversion happens without
  data loss, then cache the converted value
  and return it during val_str().
  Otherwise, if conversion loses data, return
  Illeral mix of collations error, as it happened
  previously.
ctype_recoding.result, ctype_recoding.test:
  Fixing tests accordingly.


sql/item.cc:
  Bug#10446 Illegal mix of collations
  Try to convert a const item into destination 
  character set. If conversion happens without
  data loss, then cache the converted value
  and return it during val_str().
  Otherwise, if conversion loses data, return
  Illeral mix of collations error, as it happened
  previously.
sql/item_strfunc.cc:
  Return cached value when it's possible.
mysql-test/t/ctype_recoding.test:
  Fixing tests accordingly.
mysql-test/r/ctype_recoding.result:
  Fixing tests accordingly.

1 files changed, 8 insertions, 1 deletions

diff --git a/mysql-test/r/ctype_recoding.result b/mysql-test/r/ctype_recoding.result
index 1c75988fd21..0b5c6f8974c 100644
--- a/mysql-test/r/ctype_recoding.result
+++ b/mysql-test/r/ctype_recoding.result
@@ -181,11 +181,18 @@ select * from t1 where a=_koi8r'×ÁÓÑ';
 a
 ×ÁÓÑ
 select * from t1 where a=concat(_koi8r'×ÁÓÑ');
-ERROR HY000: Illegal mix of collations (cp1251_general_ci,IMPLICIT) and (koi8r_general_ci,COERCIBLE) for operation '='
+a
+×ÁÓÑ
 select * from t1 where a=_latin1'×ÁÓÑ';
 ERROR HY000: Illegal mix of collations (cp1251_general_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation '='
 drop table t1;
 set names latin1;
+create table t1 (a char(10) character set utf8 collate utf8_bin);
+insert into t1 values ('       xxx');
+select * from t1 where a=lpad('xxx',10,' ');
+a
+       xxx
+drop table t1;
 set names koi8r;
 create table t1 (c1 char(10) character set cp1251);
 insert into t1 values ('ß');