olap.result, olap.test:

  Added a test case for bug #8616.
item.h:
  Fixed bug #8616.
  Added class Item_null_result used in rollup processing.
sql_select.h, sql_select.cc:
  Fixed bug #8616.
  Added JOIN::rollup_write_data to cover rollup queries
  with DISTINCT. Modified other rollup methods.

mysql-test/r/olap.result

@@ -307,3 +307,57 @@ day	sample	not_cancelled
 2004-06-07	1	0
 NULL	3	1
 DROP TABLE user_day;
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES
+(1,4),
+(2,2), (2,2),
+(4,1), (4,1), (4,1), (4,1),
+(2,1), (2,1);
+SELECT SUM(b) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)
+4
+6
+4
+14
+SELECT DISTINCT SUM(b) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)
+4
+6
+14
+SELECT SUM(b), COUNT(DISTINCT b) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)	COUNT(DISTINCT b)
+4	1
+6	2
+4	1
+14	3
+SELECT DISTINCT SUM(b), COUNT(DISTINCT b) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)	COUNT(DISTINCT b)
+4	1
+6	2
+14	3
+SELECT SUM(b), COUNT(*) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)	COUNT(*)
+4	1
+6	4
+4	4
+14	9
+SELECT DISTINCT SUM(b), COUNT(*) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)	COUNT(*)
+4	1
+6	4
+4	4
+14	9
+SELECT SUM(b), COUNT(DISTINCT b), COUNT(*) FROM t1 GROUP BY a WITH ROLLUP;
+SUM(b)	COUNT(DISTINCT b)	COUNT(*)
+4	1	1
+6	2	4
+4	1	4
+14	3	9
+SELECT DISTINCT SUM(b), COUNT(DISTINCT b), COUNT(*) FROM t1
+GROUP BY a WITH ROLLUP;
+SUM(b)	COUNT(DISTINCT b)	COUNT(*)
+4	1	1
+6	2	4
+4	1	4
+14	3	9
+DROP TABLE t1;

mysql-test/t/olap.test

@@ -125,3 +125,30 @@ SELECT
 
 DROP TABLE user_day;
 
+#
+# Test for bug #8616: distinct sum with rollup
+#
+
+CREATE TABLE t1 (a int, b int);
+
+INSERT INTO t1 VALUES
+  (1,4),
+  (2,2), (2,2),
+  (4,1), (4,1), (4,1), (4,1),
+  (2,1), (2,1);
+
+SELECT SUM(b) FROM t1 GROUP BY a WITH ROLLUP;
+SELECT DISTINCT SUM(b) FROM t1 GROUP BY a WITH ROLLUP;
+
+SELECT SUM(b), COUNT(DISTINCT b) FROM t1 GROUP BY a WITH ROLLUP;
+SELECT DISTINCT SUM(b), COUNT(DISTINCT b) FROM t1 GROUP BY a WITH ROLLUP;
+
+SELECT SUM(b), COUNT(*) FROM t1 GROUP BY a WITH ROLLUP;
+SELECT DISTINCT SUM(b), COUNT(*) FROM t1 GROUP BY a WITH ROLLUP;
+
+SELECT SUM(b), COUNT(DISTINCT b), COUNT(*) FROM t1 GROUP BY a WITH ROLLUP;
+SELECT DISTINCT SUM(b), COUNT(DISTINCT b), COUNT(*) FROM t1
+  GROUP BY a WITH ROLLUP;
+
+DROP TABLE t1;
+

sql/item.h

@@ -470,6 +470,17 @@ class Item_null :public Item
   Item *safe_charset_converter(CHARSET_INFO *tocs);
 };
 
+class Item_null_result :public Item_null
+{
+public:
+  Field *result_field;
+  Item_null_result() : Item_null(), result_field(0) {}
+  bool is_result_field() { return result_field != 0; }
+  void save_in_result_field(bool no_conversions)
+  {
+    save_in_field(result_field, no_conversions);
+  }
+};  
 
 /* Item represents one placeholder ('?') of prepared statement */
 

sql/sql_select.cc

@@ -157,7 +157,7 @@ static bool change_refs_to_tmp_fields(THD *thd, Item **ref_pointer_array,
 				      uint elements, List<Item> &items);
 static void init_tmptable_sum_functions(Item_sum **func);
 static void update_tmptable_sum_func(Item_sum **func,TABLE *tmp_table);
-static void copy_sum_funcs(Item_sum **func_ptr);
+static void copy_sum_funcs(Item_sum **func_ptr, Item_sum **end);
 static bool add_ref_to_table_cond(THD *thd, JOIN_TAB *join_tab);
 static bool init_sum_functions(Item_sum **func, Item_sum **end);
 static bool update_sum_func(Item_sum **func);
@@ -1328,7 +1328,7 @@ JOIN::exec()
       if (curr_join->tmp_having)
 	curr_join->tmp_having->update_used_tables();
       if (remove_duplicates(curr_join, curr_tmp_table,
-			    curr_join->fields_list, curr_join->tmp_having))
+			    *curr_fields_list, curr_join->tmp_having))
 	DBUG_VOID_RETURN;
       curr_join->tmp_having=0;
       curr_join->select_distinct=0;
@@ -6740,26 +6740,32 @@ end_write_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
     {
       if (join->procedure)
 	join->procedure->end_group();
-      if (idx < (int) join->send_group_parts)
+      int send_group_parts= join->send_group_parts;
+      if (idx < send_group_parts)
       {
 	if (!join->first_record)
 	{
 	  /* No matching rows for group function */
 	  join->clear();
 	}
-	copy_sum_funcs(join->sum_funcs);
-	if (!join->having || join->having->val_int())
+        copy_sum_funcs(join->sum_funcs,
+                       join->sum_funcs_end[send_group_parts]);
+	if (join->having && join->having->val_int() == 0)
+          error= -1;
+        else if ((error=table->file->write_row(table->record[0])))
 	{
-	  if ((error=table->file->write_row(table->record[0])))
-	  {
-	    if (create_myisam_from_heap(join->thd, table,
-					&join->tmp_table_param,
-					error, 0))
-	      DBUG_RETURN(-1);			// Not a table_is_full error
-	  }
-	  else
-	    join->send_records++;
+	  if (create_myisam_from_heap(join->thd, table,
+				      &join->tmp_table_param,
+				      error, 0))
+	    DBUG_RETURN(-1);		       
+        }
+        if (join->rollup.state != ROLLUP::STATE_NONE && error <= 0)
+	{
+	  if (join->rollup_write_data((uint) (idx+1), table))
+	    error= 1;
 	}
+	if (error > 0)
+	  DBUG_RETURN(-1);	  
 	if (end_of_records)
 	  DBUG_RETURN(0);
       }
@@ -8888,11 +8894,10 @@ update_tmptable_sum_func(Item_sum **func_ptr,
 	/* Copy result of sum functions to record in tmp_table */
 
 static void
-copy_sum_funcs(Item_sum **func_ptr)
+copy_sum_funcs(Item_sum **func_ptr, Item_sum **end_ptr)
 {
-  Item_sum *func;
-  for (; (func = *func_ptr) ; func_ptr++)
-    (void) func->save_in_result_field(1);
+  for (; func_ptr != end_ptr ; func_ptr++)
+    (void) (*func_ptr)->save_in_result_field(1);
   return;
 }
 
@@ -9013,14 +9018,16 @@ bool JOIN::rollup_init()
   */
   tmp_table_param.group_parts= send_group_parts;
 
-  if (!(rollup.fields= (List<Item>*) thd->alloc((sizeof(Item*) +
-						 sizeof(List<Item>) +
-						 ref_pointer_array_size)
-						* send_group_parts)))
+  if (!(rollup.null_items= (Item_null_result**) thd->alloc((sizeof(Item*) +
+                                                sizeof(Item**) +
+                                                sizeof(List<Item>) +
+				                ref_pointer_array_size)
+				                * send_group_parts )))
     return 1;
+  
+  rollup.fields= (List<Item>*) (rollup.null_items + send_group_parts);
   rollup.ref_pointer_arrays= (Item***) (rollup.fields + send_group_parts);
   ref_array= (Item**) (rollup.ref_pointer_arrays+send_group_parts);
-  rollup.item_null= new (thd->mem_root) Item_null();
 
   /*
     Prepare space for field list for the different levels
@@ -9028,12 +9035,16 @@ bool JOIN::rollup_init()
   */
   for (i= 0 ; i < send_group_parts ; i++)
   {
+    rollup.null_items[i]= new (thd->mem_root) Item_null_result();
     List<Item> *rollup_fields= &rollup.fields[i];
     rollup_fields->empty();
     rollup.ref_pointer_arrays[i]= ref_array;
     ref_array+= all_fields.elements;
+  }
+  for (i= 0 ; i < send_group_parts; i++)
+  {
     for (j=0 ; j < fields_list.elements ; j++)
-      rollup_fields->push_back(rollup.item_null);
+      rollup.fields[i].push_back(rollup.null_items[i]);
   }
   return 0;
 }
@@ -9137,7 +9148,8 @@ bool JOIN::rollup_make_fields(List<Item> &fields_arg, List<Item> &sel_fields,
       {
 	/* Check if this is something that is part of this group by */
 	ORDER *group_tmp;
-	for (group_tmp= start_group ; group_tmp ; group_tmp= group_tmp->next)
+	for (group_tmp= start_group, i-- ;
+             group_tmp ; group_tmp= group_tmp->next, i++)
 	{
 	  if (*group_tmp->item == item)
 	  {
@@ -9146,7 +9158,9 @@ bool JOIN::rollup_make_fields(List<Item> &fields_arg, List<Item> &sel_fields,
 	      set to NULL in this level
 	    */
 	    item->maybe_null= 1;		// Value will be null sometimes
-	    item= rollup.item_null;
+            Item_null_result *null_item= rollup.null_items[i];
+            null_item->result_field= ((Item_field *) item)->result_field;
+            item= null_item;
 	    break;
 	  }
 	}
@@ -9206,6 +9220,58 @@ int JOIN::rollup_send_data(uint idx)
   return 0;
 }
 
+/*
+  Write all rollup levels higher than the current one to a temp table
+
+  SYNOPSIS:
+    rollup_write_data()
+    idx                 Level we are on:
+                        0 = Total sum level
+                        1 = First group changed  (a)
+                        2 = Second group changed (a,b)
+    table               reference to temp table
+
+  SAMPLE
+    SELECT a, b, SUM(c) FROM t1 GROUP BY a,b WITH ROLLUP
+
+  RETURN
+    0	ok
+    1   if write_data_failed()
+*/
+
+int JOIN::rollup_write_data(uint idx, TABLE *table)
+{
+  uint i;
+  for (i= send_group_parts ; i-- > idx ; )
+  {
+    /* Get reference pointers to sum functions in place */
+    memcpy((char*) ref_pointer_array,
+	   (char*) rollup.ref_pointer_arrays[i],
+	   ref_pointer_array_size);
+    if ((!having || having->val_int()))
+    {
+      int error;
+      Item *item;
+      List_iterator_fast<Item> it(rollup.fields[i]);
+      while ((item= it++))
+      {
+        if (item->type() == Item::NULL_ITEM && item->is_result_field())
+          item->save_in_result_field(1);
+      }
+      copy_sum_funcs(sum_funcs_end[i+1], sum_funcs_end[i]);
+      if ((error= table->file->write_row(table->record[0])))
+      {
+	if (create_myisam_from_heap(thd, table, &tmp_table_param,
+				      error, 0))
+	  return 1;		     
+      }
+    }
+  }
+  /* Restore ref_pointer_array */
+  set_items_ref_array(current_ref_pointer_array);
+  return 0;
+}
+
 /*
   clear results if there are not rows found for group
   (end_send_group/end_write_group)

sql/sql_select.h

@@ -124,7 +124,7 @@ typedef struct st_rollup
 {
   enum State { STATE_NONE, STATE_INITED, STATE_READY };
   State state;
-  Item *item_null;
+  Item_null_result **null_items;
   Item ***ref_pointer_arrays;
   List<Item> *fields;
 } ROLLUP;
@@ -295,6 +295,7 @@ class JOIN :public Sql_alloc
   bool rollup_make_fields(List<Item> &all_fields, List<Item> &fields,
 			  Item_sum ***func);
   int rollup_send_data(uint idx);
+  int rollup_write_data(uint idx, TABLE *table);
   bool test_in_subselect(Item **where);
   void join_free(bool full);
   void clear();