From 1a92f475612c22fb1bd660bfb6a67dc75eb5693d Mon Sep 17 00:00:00 2001
From: venyii <schefflor@gmail.com>
Date: Thu, 24 Mar 2016 16:37:06 +0100
Subject: [PATCH] Initialize the aggregation builder stages property with an
 empty array

This will fix a PHP warning when calling `getPipeline()` on an Aggregation
builder without any stages since array_map expects an array as second argument, but the `$stages`
property is still `null`. The new behaviour is consistent with the Query builder, which also
returns an empty array.
---
 lib/Doctrine/MongoDB/Aggregation/Builder.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Doctrine/MongoDB/Aggregation/Builder.php b/lib/Doctrine/MongoDB/Aggregation/Builder.php
index 78564b22..2cfb92a0 100644
--- a/lib/Doctrine/MongoDB/Aggregation/Builder.php
+++ b/lib/Doctrine/MongoDB/Aggregation/Builder.php
@@ -41,7 +41,7 @@ class Builder
     /**
      * @var Stage[]
      */
-    private $stages;
+    private $stages = array();
 
     /**
      * Create a new aggregation builder.