From de550988989b084f012f00657d7bf494d85882e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Xavier=20L=C3=A9aut=C3=A9?= <xavier@metamarkets.com>
Date: Wed, 12 Mar 2014 10:47:23 -0700
Subject: [PATCH] add comment

---
 .../io/druid/query/aggregation/post/ConstantPostAggregator.java  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/processing/src/main/java/io/druid/query/aggregation/post/ConstantPostAggregator.java b/processing/src/main/java/io/druid/query/aggregation/post/ConstantPostAggregator.java
index f9c1bcecbce..338a3cfcb34 100644
--- a/processing/src/main/java/io/druid/query/aggregation/post/ConstantPostAggregator.java
+++ b/processing/src/main/java/io/druid/query/aggregation/post/ConstantPostAggregator.java
@@ -42,6 +42,7 @@ public class ConstantPostAggregator implements PostAggregator
       @JsonProperty("value") Number constantValue
   )
   {
+    // only value should be required for constants
     Preconditions.checkNotNull(constantValue, "Constant value must not be null");
     this.name = name;
     this.constantValue = constantValue;