New error message for situation like:

SELECT latin1_expr COLLATE anpther_charset_collation

include/mysqld_error.h

@@ -267,4 +267,5 @@
 #define ER_TABLENAME_NOT_ALLOWED_HERE 1248
 #define ER_NOT_SUPPORTED_AUTH_MODE    1249
 #define ER_SPATIAL_CANT_HAVE_NULL 1250
-#define ER_ERROR_MESSAGES 251
+#define ER_COLLATION_CHARSET_MISMATCH 1251
+#define ER_ERROR_MESSAGES 252

sql/item_strfunc.cc

@@ -2196,13 +2196,22 @@ bool Item_func_set_collation::fix_fields(THD *thd,struct st_table_list *tables,
   if (args[0]->fix_fields(thd, tables, args) || args[0]->check_cols(1))
     return 1;
   maybe_null=args[0]->maybe_null;
+  if (strcmp(args[0]->charset()->csname,set_collation->csname))
+  {
+    if (strcmp(set_collation->name,"binary"))
+    {
+      my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), 
+        set_collation->name,args[0]->charset()->csname);
+      return 1;
+    }
+  }
   set_charset(set_collation);
+  coercibility= COER_EXPLICIT;
   with_sum_func= with_sum_func || args[0]->with_sum_func;
   used_tables_cache=args[0]->used_tables();
   const_item_cache=args[0]->const_item();
   fix_length_and_dec();
   fixed= 1;
-  coercibility= COER_EXPLICIT;
   return 0;
 }
 

sql/share/czech/errmsg.txt

@@ -261,3 +261,4 @@ v/*
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/danish/errmsg.txt

@@ -255,3 +255,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/dutch/errmsg.txt

@@ -263,3 +263,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/english/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/estonian/errmsg.txt

@@ -257,3 +257,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/french/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/german/errmsg.txt

@@ -262,3 +262,4 @@
 "Tabelle '%-.64s', die in einem der SELECT-Befehle verwendet wurde kann nicht in %-.32s verwendet werden",
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client",
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/greek/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/hungarian/errmsg.txt

@@ -254,3 +254,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/italian/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/japanese/errmsg.txt

@@ -254,3 +254,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/korean/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/norwegian-ny/errmsg.txt

@@ -254,3 +254,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/norwegian/errmsg.txt

@@ -254,3 +254,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/polish/errmsg.txt

@@ -256,3 +256,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/portuguese/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/romanian/errmsg.txt

@@ -256,3 +256,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/russian/errmsg.txt

@@ -255,3 +255,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/serbian/errmsg.txt

@@ -248,3 +248,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/slovak/errmsg.txt

@@ -260,3 +260,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/spanish/errmsg.txt

@@ -253,3 +253,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/swedish/errmsg.txt

@@ -252,3 +252,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"

sql/share/ukrainian/errmsg.txt

@@ -257,3 +257,4 @@
 "Table '%-.64s' from one of SELECT's can not be used  in %-.32s"
 "Client does not support authentication protocol requested by server. Consider upgrading MySQL client"
 "All parts of a SPATIAL KEY must be NOT NULL"
+"COLLATION '%s' is not valid for CHARACTER SET '%s'"