olap.test:

  Added a test case for bug #8617.
sql_select.cc:
  Fixed bug #8617.
  Queries with ROLLUP and LIMIT n returned more than n rows
  if SQL_CALC_FOUND_ROWS was used.

mysql-test/r/olap.result

@@ -379,3 +379,16 @@ a	sum(b)
 4	4
 NULL	14
 DROP TABLE t1;
+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 a, SUM(b) FROM t1 GROUP BY a WITH ROLLUP LIMIT 1;
+a	SUM(b)
+1	4
+SELECT SQL_CALC_FOUND_ROWS a, SUM(b) FROM t1 GROUP BY a WITH ROLLUP LIMIT 1;
+a	SUM(b)
+1	4
+DROP TABLE t1;

mysql-test/t/olap.test

@@ -155,3 +155,19 @@ SELECT DISTINCT a, sum(b) FROM t1 GROUP BY a,b WITH ROLLUP;
 
 DROP TABLE t1;
 
+#
+# Tests for bugs #8617: SQL_CACL_FOUND_ROWS with rollup and limit 
+#
+
+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 a, SUM(b) FROM t1 GROUP BY a WITH ROLLUP LIMIT 1;
+SELECT SQL_CALC_FOUND_ROWS a, SUM(b) FROM t1 GROUP BY a WITH ROLLUP LIMIT 1;
+
+DROP TABLE t1;

sql/sql_select.cc

@@ -9210,7 +9210,7 @@ int JOIN::rollup_send_data(uint idx)
 	   ref_pointer_array_size);
     if ((!having || having->val_int()))
     {
-      if (send_records < unit->select_limit_cnt &&
+      if (send_records < unit->select_limit_cnt && do_send_rows &&
 	  result->send_data(rollup.fields[i]))
 	return 1;
       send_records++;