Bug 2701: Function CHARSET() inconsistency

CONVERT3 was removed, it was for test purposes,
and rather harmful.

mysql-test/r/cast.result

@@ -64,12 +64,6 @@ test
 select cast(_koi8r'' as char character set cp1251);
 cast(_koi8r'' as char character set cp1251)
 
-select convert(_latin1'test', "latin1_german1_ci", "latin1_swedish_ci");
-convert(_latin1'test', "latin1_german1_ci", "latin1_swedish_ci")
-test
-select convert(_koi8r'', "koi8r_general_ci", "cp1251_general_ci");
-convert(_koi8r'', "koi8r_general_ci", "cp1251_general_ci")
-
 create table t1 select cast(_koi8r'' as char character set cp1251) as t;
 show create table t1;
 Table	Create Table

mysql-test/r/func_system.result

@@ -51,6 +51,20 @@ t1	CREATE TABLE `t1` (
   `version` char(40) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
+select charset(charset(_utf8'a')), charset(collation(_utf8'a'));
+charset(charset(_utf8'a'))	charset(collation(_utf8'a'))
+utf8	utf8
+select collation(charset(_utf8'a')), collation(collation(_utf8'a'));
+collation(charset(_utf8'a'))	collation(collation(_utf8'a'))
+utf8_general_ci	utf8_general_ci
+create table t1 select charset(_utf8'a'), collation(_utf8'a');
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `charset(_utf8'a')` char(64) character set utf8 NOT NULL default '',
+  `collation(_utf8'a')` char(64) character set utf8 NOT NULL default ''
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
 select TRUE,FALSE,NULL;
 TRUE	FALSE	NULL
 1	0	NULL

mysql-test/t/cast.test

@@ -28,8 +28,6 @@ select CAST(DATE "2004-01-22 21:45:33" AS CHAR(4) BINARY);
 set names binary;
 select cast(_latin1'test' as char character set latin2);
 select cast(_koi8r'' as char character set cp1251);
-select convert(_latin1'test', "latin1_german1_ci", "latin1_swedish_ci");
-select convert(_koi8r'', "koi8r_general_ci", "cp1251_general_ci");
 create table t1 select cast(_koi8r'' as char character set cp1251) as t;
 show create table t1;
 drop table t1;

mysql-test/t/ctype_many.test

@@ -147,11 +147,6 @@ UPDATE t1 SET utf8_f=CONVERT(koi8_ru_f USING utf8);
 SET CHARACTER SET koi8r;
 SELECT * FROM t1;
 
-#
-# codecovarage for Item_func_conv_charset3
-#
-select CONVERT(koi8_ru_f, 'cp1251_general_ci', 'utf8_general_ci'), comment from t1;
-explain extended select CONVERT(koi8_ru_f, 'cp1251_general_ci', 'utf8_general_ci'), comment from t1;
 
 ALTER TABLE t1 ADD bin_f CHAR(32) BYTE NOT NULL;
 UPDATE t1 SET bin_f=koi8_ru_f;

mysql-test/t/func_system.test

@@ -23,4 +23,10 @@ create table t1 (version char(40)) select database(), user(), version() as 'vers
 show create table t1;
 drop table t1;
 
+select charset(charset(_utf8'a')), charset(collation(_utf8'a'));
+select collation(charset(_utf8'a')), collation(collation(_utf8'a'));
+create table t1 select charset(_utf8'a'), collation(_utf8'a');
+show create table t1;
+drop table t1;
+
 select TRUE,FALSE,NULL;

sql/item_strfunc.cc

@@ -2124,42 +2124,6 @@ void Item_func_conv_charset::print(String *str)
   str->append(')');
 }
 
-String *Item_func_conv_charset3::val_str(String *str)
-{
-  char cs1[30], cs2[30];
-  String to_cs_buff(cs1, sizeof(cs1), default_charset_info);
-  String from_cs_buff(cs2, sizeof(cs2), default_charset_info);
-  String *arg= args[0]->val_str(str);
-  String *to_cs= args[1]->val_str(&to_cs_buff);
-  String *from_cs= args[2]->val_str(&from_cs_buff);
-  CHARSET_INFO *from_charset;
-  CHARSET_INFO *to_charset;
-
-  if (!arg     || args[0]->null_value ||
-      !to_cs   || args[1]->null_value ||
-      !from_cs || args[2]->null_value ||
-      !(from_charset=get_charset_by_name(from_cs->ptr(), MYF(MY_WME))) ||
-      !(to_charset=get_charset_by_name(to_cs->ptr(), MYF(MY_WME))))
-  {
-    null_value= 1;
-    return 0;
-  }
-
-  if (str_value.copy(arg->ptr(), arg->length(), from_charset, to_charset))
-  {
-    null_value= 1;
-    return 0;
-  }
-  null_value= 0;
-  return &str_value;
-}
-
-
-void Item_func_conv_charset3::fix_length_and_dec()
-{
-  max_length = args[0]->max_length;
-}
-
 String *Item_func_set_collation::val_str(String *str)
 {
   str=args[0]->val_str(str);
@@ -2226,7 +2190,7 @@ String *Item_func_charset::val_str(String *str)
   if ((null_value=(args[0]->null_value || !res->charset())))
     return 0;
   str->copy(res->charset()->csname,strlen(res->charset()->csname),
-	    &my_charset_latin1, default_charset());
+	    &my_charset_latin1, collation.collation);
   return str;
 }
 
@@ -2237,7 +2201,7 @@ String *Item_func_collation::val_str(String *str)
   if ((null_value=(args[0]->null_value || !res->charset())))
     return 0;
   str->copy(res->charset()->name,strlen(res->charset()->name),
-	    &my_charset_latin1, default_charset());
+	    &my_charset_latin1, collation.collation);
   return str;
 }
 

sql/item_strfunc.h

@@ -619,16 +619,6 @@ class Item_func_set_collation :public Item_str_func
   void print(String *str) { print_op(str); }
 };
 
-class Item_func_conv_charset3 :public Item_str_func
-{
-public:
-  Item_func_conv_charset3(Item *arg1,Item *arg2,Item *arg3)
-    :Item_str_func(arg1,arg2,arg3) {}
-  String *val_str(String *);
-  void fix_length_and_dec();
-  const char *func_name() const { return "convert"; }
-};
-
 class Item_func_charset :public Item_str_func
 {
 public:
@@ -637,8 +627,8 @@ class Item_func_charset :public Item_str_func
   const char *func_name() const { return "charset"; }
   void fix_length_and_dec() 
   {
-     max_length=40; // should be enough
      collation.set(system_charset_info);
+     max_length= 64 * collation.collation->mbmaxlen; // should be enough
   };
 };
 
@@ -650,8 +640,8 @@ class Item_func_collation :public Item_str_func
   const char *func_name() const { return "collation"; }
   void fix_length_and_dec()
   {
-     max_length=40; // should be enough
      collation.set(system_charset_info);
+     max_length= 64 * collation.collation->mbmaxlen; // should be enough
   };
 };
 

sql/sql_yacc.yy

@@ -2574,8 +2574,6 @@ simple_expr:
 	  }
 	| CONVERT_SYM '(' expr USING charset_name ')'
 	  { $$= new Item_func_conv_charset($3,$5); }
-	| CONVERT_SYM '(' expr ',' expr ',' expr ')'
-	  { $$= new Item_func_conv_charset3($3,$7,$5); }
 	| DEFAULT '(' simple_ident ')'
 	  { $$= new Item_default_value($3); }
 	| VALUES '(' simple_ident ')'