From 31f1fe0be13568eced6ae550307d16d233fb877a Mon Sep 17 00:00:00 2001
From: Travis <travis@pilosa.com>
Date: Fri, 25 Aug 2017 19:23:09 -0500
Subject: [PATCH] set container.n in differenceRunRun

---
 roaring/roaring.go               | 1 +
 roaring/roaring_internal_test.go | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/roaring/roaring.go b/roaring/roaring.go
index fa744e829..77dfd8803 100644
--- a/roaring/roaring.go
+++ b/roaring/roaring.go
@@ -2621,6 +2621,7 @@ func differenceRunRun(a, b *container) *container {
 		}
 	}
 
+	output.n = output.count()
 	return output
 }
 
diff --git a/roaring/roaring_internal_test.go b/roaring/roaring_internal_test.go
index c0caed990..5d1a985d1 100644
--- a/roaring/roaring_internal_test.go
+++ b/roaring/roaring_internal_test.go
@@ -1601,6 +1601,7 @@ func TestDifferenceRunRun(t *testing.T) {
 		aruns []interval16
 		bruns []interval16
 		exp   []interval16
+		expn  int
 	}{
 		{
 			// this tests all six overlap combinations
@@ -1609,6 +1610,7 @@ func TestDifferenceRunRun(t *testing.T) {
 			aruns: []interval16{{start: 3, last: 6}, {start: 13, last: 16}, {start: 24, last: 26}, {start: 33, last: 38}, {start: 43, last: 46}, {start: 53, last: 56}},
 			bruns: []interval16{{start: 1, last: 8}, {start: 11, last: 14}, {start: 21, last: 23}, {start: 35, last: 37}, {start: 44, last: 48}, {start: 57, last: 59}},
 			exp:   []interval16{{start: 15, last: 16}, {start: 24, last: 26}, {start: 33, last: 34}, {start: 38, last: 38}, {start: 43, last: 43}, {start: 53, last: 56}},
+			expn:  13,
 		},
 	}
 	for i, test := range tests {
@@ -1620,6 +1622,9 @@ func TestDifferenceRunRun(t *testing.T) {
 		if !reflect.DeepEqual(ret.runs, test.exp) {
 			t.Fatalf("test #%v expected %v, but got %v", i, test.exp, ret.runs)
 		}
+		if ret.n != test.expn {
+			t.Fatalf("test #%v expected n=%v, but got n=%v", i, test.expn, ret.n)
+		}
 	}
 }