Add comments, tidy up sql_delete.cc to refer to thd->row_count_func

explicitly.

sql/sql_class.cc

@@ -1423,7 +1423,14 @@ bool select_to_file::send_eof()
   if (my_close(file,MYF(MY_WME)))
     error= 1;
   if (!error)
+  {
+    /*
+      In order to remember the value of affected rows for ROW_COUNT()
+      function, SELECT INTO has to have an own SQLCOM.
+      TODO: split from SQLCOM_SELECT
+    */
     ::send_ok(thd,row_count);
+  }
   file= -1;
   return error;
 }
@@ -2338,6 +2345,11 @@ bool select_dumpvar::send_eof()
   if (! row_count)
     push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                  ER_SP_FETCH_NO_DATA, ER(ER_SP_FETCH_NO_DATA));
+  /*
+    In order to remember the value of affected rows for ROW_COUNT()
+    function, SELECT INTO has to have an own SQLCOM.
+    TODO: split from SQLCOM_SELECT
+  */
   ::send_ok(thd,row_count);
   return 0;
 }

sql/sql_delete.cc

@@ -142,7 +142,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
   {
     free_underlaid_joins(thd, select_lex);
     thd->row_count_func= 0;
-    send_ok(thd);				// No matching records
+    send_ok(thd, (ha_rows) thd->row_count_func);  // No matching records
     DBUG_RETURN(0);
   }
 #endif
@@ -159,7 +159,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     delete select;
     free_underlaid_joins(thd, select_lex);
     thd->row_count_func= 0;
-    send_ok(thd,0L);
+    send_ok(thd, (ha_rows) thd->row_count_func);
     /*
       We don't need to call reset_auto_increment in this case, because
       mysql_truncate always gives a NULL conds argument, hence we never
@@ -386,7 +386,7 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
   if (error < 0 || (thd->lex->ignore && !thd->is_fatal_error))
   {
     thd->row_count_func= deleted;
-    send_ok(thd,deleted);
+    send_ok(thd, (ha_rows) thd->row_count_func);
     DBUG_PRINT("info",("%ld records deleted",(long) deleted));
   }
   DBUG_RETURN(error >= 0 || thd->net.report_error);
@@ -889,7 +889,7 @@ bool multi_delete::send_eof()
   if (!local_error)
   {
     thd->row_count_func= deleted;
-    ::send_ok(thd, deleted);
+    ::send_ok(thd, (ha_rows) thd->row_count_func);
   }
   return 0;
 }