Merge mysql.com:/home/mydev/mysql-4.1-4100

into mysql.com:/home/mydev/mysql-5.0-5000

3 files changed, 14 insertions, 7 deletions

diff --git a/sql/item_timefunc.cc b/sql/item_timefunc.cc
index 32813454fef..5a069aee554 100644
--- a/sql/item_timefunc.cc
+++ b/sql/item_timefunc.cc
@@ -2134,7 +2134,6 @@ String *Item_char_typecast::val_str(String *str)
   String *res;
   uint32 length;
 
-#if 0
   if (!charset_conversion)
   {
     if (!(res= args[0]->val_str(str)))
@@ -2144,7 +2143,6 @@ String *Item_char_typecast::val_str(String *str)
     }
   }
   else
-#endif
   {
     // Convert character set if differ
     uint dummy_errors;
@@ -2182,9 +2180,18 @@ String *Item_char_typecast::val_str(String *str)
 void Item_char_typecast::fix_length_and_dec()
 {
   uint32 char_length;
-  charset_conversion= !my_charset_same(args[0]->collation.collation, cast_cs) &&
-		      args[0]->collation.collation != &my_charset_bin &&
-		      cast_cs != &my_charset_bin;
+  /* 
+     We always force character set conversion if cast_cs
+     is a multi-byte character set. It garantees that the
+     result of CAST is a well-formed string.
+     For single-byte character sets we allow just to copy
+     from the argument. A single-byte character sets string
+     is always well-formed. 
+  */
+  charset_conversion= (cast_cs->mbmaxlen > 1) ||
+                      !my_charset_same(args[0]->collation.collation, cast_cs) &&
+                      args[0]->collation.collation != &my_charset_bin &&
+                      cast_cs != &my_charset_bin;
   collation.set(cast_cs, DERIVATION_IMPLICIT);
   char_length= (cast_length >= 0) ? cast_length : 
 	       args[0]->max_length/args[0]->collation.collation->mbmaxlen;
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index cac3dfd4dc5..bd0e1455eb2 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -982,7 +982,7 @@ extern Gt_creator gt_creator;
 extern Lt_creator lt_creator;
 extern Ge_creator ge_creator;
 extern Le_creator le_creator;
-extern char language[LIBLEN],reg_ext[FN_EXTLEN];
+extern char language[FN_REFLEN], reg_ext[FN_EXTLEN];
 extern char glob_hostname[FN_REFLEN], mysql_home[FN_REFLEN];
 extern char pidfile_name[FN_REFLEN], system_time_zone[30], *opt_init_file;
 extern char log_error_file[FN_REFLEN];
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index c9d2abb932d..9b39f51fc5b 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -351,7 +351,7 @@ char *default_tz_name;
 char log_error_file[FN_REFLEN], glob_hostname[FN_REFLEN];
 char* log_error_file_ptr= log_error_file;
 char mysql_real_data_home[FN_REFLEN],
-     language[LIBLEN],reg_ext[FN_EXTLEN], mysql_charsets_dir[FN_REFLEN],
+     language[FN_REFLEN], reg_ext[FN_EXTLEN], mysql_charsets_dir[FN_REFLEN],
      *mysqld_user,*mysqld_chroot, *opt_init_file,
      *opt_init_connect, *opt_init_slave,
      def_ft_boolean_syntax[sizeof(ft_boolean_syntax)];