fts+const_tables bug fixed

sql/item_func.cc

@@ -2056,6 +2056,7 @@ bool Item_func_match::fix_fields(THD *thd,struct st_table_list *tlist)
   }
   const_item_cache=0;
   table=((Item_field *)fields.head())->field->table;
+  table->fulltext_searched=1;
   return 0;
 }
 

sql/item_func.h

@@ -880,6 +880,7 @@ public:
 	ft_close_search(ft_handler);
         if(join_key)
           table->file->ft_handler=0;
+        table->fulltext_searched=0;
       }
     }
   }

sql/sql_select.cc

@@ -885,7 +885,8 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
       s->dependent=(table_map) 0;
     s->key_dependent=(table_map) 0;
     if ((table->system || table->file->records <= 1) && ! s->dependent &&
-	!(table->file->option_flag() & HA_NOT_EXACT_COUNT))
+	!(table->file->option_flag() & HA_NOT_EXACT_COUNT) &&
+        !table->fulltext_searched)
     {
       s->type=JT_SYSTEM;
       const_table_map|=table->map;
@@ -983,7 +984,8 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
 	  } while (keyuse->table == table && keyuse->key == key);
 
 	  if (eq_part == PREV_BITS(uint,table->key_info[key].key_parts) &&
-	      (table->key_info[key].flags & HA_NOSAME))
+	      (table->key_info[key].flags & HA_NOSAME) &&
+              !table->fulltext_searched)
 	  {
 	    if (const_ref == eq_part)
 	    {					// Found everything for ref.

sql/table.h

@@ -95,6 +95,7 @@ struct st_table {
   my_bool db_low_byte_first;		/* Portable row format */
   my_bool locked_by_flush;
   my_bool locked_by_name;
+  my_bool fulltext_searched;
   my_bool crashed;
   my_bool is_view;
   Field *next_number_field,		/* Set if next_number is activated */