There is no Item->binary() anymore. It was remain from 4.0.

sql/item.h

@@ -185,9 +185,6 @@ public:
     collation.collation= collation_arg->collation; 
     collation.derivation= collation_arg->derivation;
   }
-  bool binary() const
-  { return charset()->state & MY_CS_BINSORT ? 1 : 0 ; }
-  
   virtual void set_outer_resolving() {}
 
   // Row emulation

sql/item_cmpfunc.cc

@@ -380,12 +380,7 @@ bool Item_in_optimizer::fix_fields(THD *thd, struct st_table_list *tables,
     return 1;
   if (args[0]->maybe_null)
     maybe_null=1;
-  /*
-    TODO: Check if following is right
-    (set_charset set type of result, not how compare should be used)
-  */
-  if (args[0]->binary())
-    set_charset(&my_charset_bin);
+
   with_sum_func= args[0]->with_sum_func;
   used_tables_cache= args[0]->used_tables();
   const_item_cache= args[0]->const_item();
@@ -933,7 +928,7 @@ Item *Item_func_case::find_item(String *str)
       if ((tmp=args[i]->val_str(str)))		// If not null
       {
 	/* QQ: COERCIBILITY */
-	if (first_expr_is_binary || args[i]->binary())
+	if (first_expr_is_binary || (args[i]->charset()->state & MY_CS_BINSORT))
 	{
 	  if (sortcmp(tmp,first_expr_str,&my_charset_bin)==0)
 	    return args[i+1];
@@ -1044,7 +1039,7 @@ Item_func_case::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
     used_tables_cache|=(first_expr)->used_tables();
     const_item_cache&= (first_expr)->const_item();
     with_sum_func= with_sum_func || (first_expr)->with_sum_func;
-    first_expr_is_binary= first_expr->binary();
+    first_expr_is_binary= first_expr->charset()->state & MY_CS_BINSORT;
   }
   if (else_expr)
   {

sql/item_cmpfunc.h

@@ -129,8 +129,6 @@ public:
   bool have_rev_func() const { return rev_functype() != UNKNOWN_FUNC; }
   void print(String *str) { Item_func::print_op(str); }
   bool is_null() { return test(args[0]->is_null() || args[1]->is_null()); }
-  virtual bool binary() const 
-  { return test(cmp_collation.collation->state & MY_CS_BINSORT); }
 
   static Item_bool_func2* eq_creator(Item *a, Item *b);
   static Item_bool_func2* ne_creator(Item *a, Item *b);

sql/item_func.cc

@@ -1353,7 +1353,18 @@ udf_handler::fix_fields(THD *thd, TABLE_LIST *tables, Item_result_field *func,
       Item *item= *arg;
       if (item->fix_fields(thd, tables, arg) || item->check_cols(1))
 	return 1;
-      if (item->binary())
+      /*
+	TODO: We should think about this. It is not always
+	right way just to set an UDF result to return my_charset_bin
+	if one argument has binary sorting order.
+	The result collation should be calculated according to arguments
+	derivations in some cases and should not in other cases.
+	Moreover, some arguments can represent a numeric input
+	which doesn't effect the result character set and collation.
+	There is no a general rule for UDF. Everything depends on
+	the particular user definted function.
+      */
+      if (item->charset()->state & MY_CS_BINSORT)
 	func->set_charset(&my_charset_bin);
       if (item->maybe_null)
 	func->maybe_null=1;

sql/item_strfunc.cc

@@ -748,7 +748,7 @@ String *Item_func_replace::val_str(String *str)
   res->set_charset(collation.collation);
 
 #ifdef USE_MB
-  binary_cmp = (args[0]->binary() || args[1]->binary() || !use_mb(res->charset()));
+  binary_cmp = ((res->charset()->state & MY_CS_BINSORT) || !use_mb(res->charset()));
 #endif
 
   if (res2->length() == 0)

sql/sql_analyse.cc

@@ -44,12 +44,6 @@ int sortcmp2(void* cmp_arg __attribute__((unused)),
   return sortcmp(a,b,a->charset());
 }
 
-int stringcmp2(void* cmp_arg __attribute__((unused)),
-	     const String *a,const String *b)
-{
-  return sortcmp(a,b,&my_charset_bin);
-}
-
 int compare_double2(void* cmp_arg __attribute__((unused)),
 		    const double *s, const double *t)
 {

sql/sql_analyse.h

@@ -99,8 +99,6 @@ int collect_string(String *element, element_count count,
 
 int sortcmp2(void* cmp_arg __attribute__((unused)),
 	     const String *a,const String *b);
-int stringcmp2(void* cmp_arg __attribute__((unused)),
-	     const String *a,const String *b);
 
 class field_str :public field_info
 {
@@ -117,8 +115,7 @@ public:
     max_arg("",default_charset_info), sum(0),
     must_be_blob(0), was_zero_fill(0),
     was_maybe_zerofill(0), can_be_still_num(1)
-    { init_tree(&tree, 0, 0, sizeof(String), a->binary() ?
-		(qsort_cmp2) stringcmp2 : (qsort_cmp2) sortcmp2,
+    { init_tree(&tree, 0, 0, sizeof(String), (qsort_cmp2) sortcmp2,
 		0, (tree_element_free) free_string, NULL); };
 
   void	 add();