CAST(expr AS char) now supports character set with conversion:

SELECT CAST(_latin1'string' AS CHAR CHARACTER SET latin2)

mysql-test/r/cast.result

@@ -28,6 +28,19 @@ cast("2001-1-1" as DATE)	cast("2001-1-1" as DATETIME)
 select cast("1:2:3" as TIME);
 cast("1:2:3" as TIME)
 01:02:03
+select cast(_latin1'test' as char character set latin2);
+cast(_latin1'test' as char character set latin2)
+test
+select cast(_koi8r'' as char character set cp1251);
+cast(_koi8r'' as char character set cp1251)
+
+create table t1 select cast(_koi8r'' as char character set cp1251) as t;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `t` char(4) character set cp1251 NOT NULL default ''
+) TYPE=MyISAM CHARSET=latin1
+drop table t1;
 select cast("2001-1-1" as date) = "2001-01-01";
 cast("2001-1-1" as date) = "2001-01-01"
 0

mysql-test/t/cast.test

@@ -13,6 +13,15 @@ select cast("A" as binary) = "a", cast(BINARY "a" as CHAR) = "A";
 select cast("2001-1-1" as DATE), cast("2001-1-1" as DATETIME);
 select cast("1:2:3" as TIME);
 
+#
+# Character set convertion
+#
+select cast(_latin1'test' as char character set latin2);
+select cast(_koi8r'' as char character set cp1251);
+create table t1 select cast(_koi8r'' as char character set cp1251) as t;
+show create table t1;
+drop table t1;
+
 #
 # The following should be fixed in 4.1
 #

sql/item_create.cc

@@ -457,13 +457,16 @@ Item *create_load_file(Item* a)
 }
 
 
-Item *create_func_cast(Item *a, Item_cast cast_type)
+Item *create_func_cast(Item *a, Item_cast cast_type, CHARSET_INFO *cs)
 {
   Item *res;
   LINT_INIT(res);
   switch (cast_type) {
   case ITEM_CAST_BINARY: 	res= new Item_func_binary(a); break;
-  case ITEM_CAST_CHAR:	 	res= new Item_char_typecast(a); break;
+  case ITEM_CAST_CHAR:
+    res= (cs == NULL) ? new Item_char_typecast(a) : 
+			new Item_func_conv_charset(a,cs);
+    break;
   case ITEM_CAST_SIGNED_INT:	res= new Item_func_signed(a); break;
   case ITEM_CAST_UNSIGNED_INT:  res= new Item_func_unsigned(a); break;
   case ITEM_CAST_DATE:		res= new Item_date_typecast(a); break;

sql/item_create.h

@@ -28,7 +28,7 @@ Item *create_func_bit_length(Item* a);
 Item *create_func_coercibility(Item* a);
 Item *create_func_ceiling(Item* a);
 Item *create_func_char_length(Item* a);
-Item *create_func_cast(Item *a, Item_cast cast_type);
+Item *create_func_cast(Item *a, Item_cast cast_type, CHARSET_INFO *cs);
 Item *create_func_connection_id(void);
 Item *create_func_conv(Item* a, Item *b, Item *c);
 Item *create_func_cos(Item* a);

sql/sql_yacc.yy

@@ -2233,10 +2233,12 @@ simple_expr:
 	    $$= new Item_func_set_collation($2,new Item_string(binary_keyword,
 					    6, &my_charset_latin1));
 	  }
-	| CAST_SYM '(' expr AS cast_type ')'  { $$= create_func_cast($3, $5); }
+	| CAST_SYM '(' expr AS cast_type ')'
+	  { $$= create_func_cast($3, $5, Lex->charset); }
 	| CASE_SYM opt_expr WHEN_SYM when_list opt_else END
 	  { $$= new Item_func_case(* $4, $2, $5 ); }
-	| CONVERT_SYM '(' expr ',' cast_type ')'  { $$= create_func_cast($3, $5); }
+	| CONVERT_SYM '(' expr ',' cast_type ')'
+	  { $$= create_func_cast($3, $5, Lex->charset); }
 	| CONVERT_SYM '(' expr USING charset_name ')'
 	  { $$= new Item_func_conv_charset($3,$5); }
 	| CONVERT_SYM '(' expr ',' expr ',' expr ')'
@@ -2645,15 +2647,15 @@ in_sum_expr:
 	};
 
 cast_type:
-	BINARY			{ $$=ITEM_CAST_BINARY; }
-	| CHAR_SYM		{ $$=ITEM_CAST_CHAR; }
-	| SIGNED_SYM		{ $$=ITEM_CAST_SIGNED_INT; }
-	| SIGNED_SYM INT_SYM	{ $$=ITEM_CAST_SIGNED_INT; }
-	| UNSIGNED		{ $$=ITEM_CAST_UNSIGNED_INT; }
-	| UNSIGNED INT_SYM	{ $$=ITEM_CAST_UNSIGNED_INT; }
-	| DATE_SYM		{ $$=ITEM_CAST_DATE; }
-	| TIME_SYM		{ $$=ITEM_CAST_TIME; }
-	| DATETIME		{ $$=ITEM_CAST_DATETIME; }
+	BINARY			{ $$=ITEM_CAST_BINARY; Lex->charset= NULL; }
+	| CHAR_SYM opt_binary	{ $$=ITEM_CAST_CHAR; }
+	| SIGNED_SYM		{ $$=ITEM_CAST_SIGNED_INT; Lex->charset= NULL; }
+	| SIGNED_SYM INT_SYM	{ $$=ITEM_CAST_SIGNED_INT; Lex->charset= NULL; }
+	| UNSIGNED		{ $$=ITEM_CAST_UNSIGNED_INT; Lex->charset= NULL; }
+	| UNSIGNED INT_SYM	{ $$=ITEM_CAST_UNSIGNED_INT; Lex->charset= NULL; }
+	| DATE_SYM		{ $$=ITEM_CAST_DATE; Lex->charset= NULL; }
+	| TIME_SYM		{ $$=ITEM_CAST_TIME; Lex->charset= NULL; }
+	| DATETIME		{ $$=ITEM_CAST_DATETIME; Lex->charset= NULL; }
 	;
 
 expr_list: