fixed memory leak

sql/item_sum.cc

@@ -1232,6 +1232,8 @@ bool Item_sum_count_distinct::setup(THD *thd)
       }
     }
 
+    if (use_tree)
+      delete_tree(tree);
     init_tree(tree, min(thd->variables.max_heap_table_size,
 			thd->variables.sortbuff_size/16), 0,
 	      key_length, compare_key, 0, NULL, cmp_arg);
@@ -1850,6 +1852,9 @@ bool Item_func_group_concat::setup(THD *thd)
   } 
   rec_offset = table->reclength - key_length;
 
+
+  if (tree_mode)
+    delete_tree(tree);
   /*
     choise function of sort
   */  

sql/item_sum.h

@@ -691,7 +691,7 @@ class Item_func_group_concat : public Item_sum
      warning_available(item.warning_available),
      key_length(item.key_length), 
      rec_offset(item.rec_offset), 
-     tree_mode(0),
+     tree_mode(item.tree_mode),
      distinct(item.distinct),
      warning_for_row(item.warning_for_row),
      separator(item.separator),
@@ -707,7 +707,7 @@ class Item_func_group_concat : public Item_sum
      count_cut_values(item.count_cut_values),
      original(&item)
     {
-     quick_group = 0;
+     quick_group= item.quick_group;
     };
   ~Item_func_group_concat();
   enum Sumfunctype sum_func () const {return GROUP_CONCAT_FUNC;}