From 50f119df4e21779495057ef43ef2b9451c2a8387 Mon Sep 17 00:00:00 2001
From: Richard Artoul <rartoul@uber.com>
Date: Thu, 29 Nov 2018 10:02:24 -0500
Subject: [PATCH] Allocate bitmap if needed (existing wrong type

---
 roaring/roaring.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/roaring/roaring.go b/roaring/roaring.go
index f152a5656..9b40399f0 100644
--- a/roaring/roaring.go
+++ b/roaring/roaring.go
@@ -519,7 +519,7 @@ func (b *Bitmap) unionIntoTarget(target *Bitmap, others ...*Bitmap) {
 				// else {
 				// Use a bitmap
 				container := target.Containers.Get(iKey)
-				if container == nil {
+				if container == nil || container.containerType != containerBitmap {
 					buf := make([]uint64, bitmapN)
 					ob := buf[:bitmapN]
 					container = &Container{