Coercibility is now stored in user vars

sql/item.h:
  Change constant values order according to the word "coercibility" nature
sql/item_func.cc:
  Change constant values order according to the word "coercibility" nature

sql/item.h

@@ -39,8 +39,8 @@ class Item {
              SUBSELECT_ITEM, ROW_ITEM, CACHE_ITEM};
 
   enum cond_result { COND_UNDEF,COND_OK,COND_TRUE,COND_FALSE };
-  enum coercion    { COER_NOCOLL=0,   COER_COERCIBLE=1, 
-  		     COER_IMPLICIT=2, COER_EXPLICIT=3  };
+  enum coercion    { COER_NOCOLL=3,   COER_COERCIBLE=2, 
+  		     COER_IMPLICIT=1, COER_EXPLICIT=0  };
 
   String str_value;			/* used to store value */
   my_string name;			/* Name from select */

sql/item_func.cc

@@ -132,7 +132,7 @@ Item_func::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
 	  coercibility= (*arg)->coercibility;
 	  set_charset((*arg)->charset());
 	}
-	else if ((*arg)->coercibility > coercibility)
+	else if ((*arg)->coercibility < coercibility)
 	{
 	  if (strcmp(charset()->csname,(*arg)->charset()->csname))
 	  {
@@ -2007,6 +2007,7 @@ static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
 }
 
 
+
 bool Item_func_set_user_var::fix_fields(THD *thd, TABLE_LIST *tables,
 					Item **ref)
 {
@@ -2030,7 +2031,8 @@ Item_func_set_user_var::fix_length_and_dec()
 
 void Item_func_set_user_var::update_hash(void *ptr, uint length,
 					 Item_result type,
-					 CHARSET_INFO *cs)
+					 CHARSET_INFO *cs,
+					 enum coercion coercibility)
 {
   if ((null_value=args[0]->null_value))
   {
@@ -2040,6 +2042,7 @@ void Item_func_set_user_var::update_hash(void *ptr, uint length,
     entry->value=0;
     entry->length=0;
     entry->var_charset=cs;
+    entry->var_coercibility= coercibility;
   }
   else
   {
@@ -2071,6 +2074,7 @@ void Item_func_set_user_var::update_hash(void *ptr, uint length,
     entry->length= length;
     entry->type=type;
     entry->var_charset=cs;
+    entry->var_coercibility= coercibility;
   }
   return;
 
@@ -2112,7 +2116,8 @@ double
 Item_func_set_user_var::val()
 {
   double value=args[0]->val();
-  update_hash((void*) &value,sizeof(value), REAL_RESULT, default_charset_info);
+  update_hash((void*) &value,sizeof(value), REAL_RESULT, 
+    &my_charset_bin, COER_NOCOLL);
   return value;
 }
 
@@ -2121,7 +2126,7 @@ Item_func_set_user_var::val_int()
 {
   longlong value=args[0]->val_int();
   update_hash((void*) &value, sizeof(longlong), INT_RESULT,
-	      default_charset_info);
+	      &my_charset_bin, COER_NOCOLL);
   return value;
 }
 
@@ -2130,10 +2135,10 @@ Item_func_set_user_var::val_str(String *str)
 {
   String *res=args[0]->val_str(str);
   if (!res)					// Null value
-    update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin);
+    update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin, COER_NOCOLL);
   else
     update_hash((void*) res->ptr(), res->length(), STRING_RESULT,
-		res->charset());
+		res->charset(), args[0]->coercibility);
   return res;
 }
 

sql/item_func.h

@@ -934,7 +934,8 @@ class Item_func_set_user_var :public Item_func
   double val();
   longlong val_int();
   String *val_str(String *str);
-  void update_hash(void *ptr, uint length, enum Item_result type, CHARSET_INFO *cs);
+  void update_hash(void *ptr, uint length, enum Item_result type, 
+  		   CHARSET_INFO *cs, enum coercion coercibility);
   bool update();
   enum Item_result result_type () const { return cached_result_type; }
   bool fix_fields(THD *thd, struct st_table_list *tables, Item **ref);

sql/log_event.cc

@@ -2177,7 +2177,7 @@ int User_var_log_event::exec_event(struct st_relay_log_info* rli)
   }
   Item_func_set_user_var e(user_var_name, it);
   e.fix_fields(thd, 0, 0);
-  e.update_hash(val, val_len, type, charset);
+  e.update_hash(val, val_len, type, charset, Item::COER_NOCOLL);
   free_root(&thd->mem_root,0);
 
   rli->inc_pending(get_event_len());

sql/sql_class.h

@@ -935,6 +935,7 @@ class user_var_entry
   ulong length, update_query_id, used_query_id;
   Item_result type;
   CHARSET_INFO *var_charset;
+  enum Item::coercion var_coercibility;
 };
 
 /* Class for unique (removing of duplicates) */