From 8ffac8f5e74424014ed34ce2141d93a2bb49508b Mon Sep 17 00:00:00 2001
From: Slim <b-slim@users.noreply.github.com>
Date: Mon, 10 Jul 2017 15:58:04 -0700
Subject: [PATCH] fix issue-4513 (#4525)

---
 server/src/main/java/io/druid/segment/indexing/DataSchema.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/server/src/main/java/io/druid/segment/indexing/DataSchema.java b/server/src/main/java/io/druid/segment/indexing/DataSchema.java
index 38e0da7d7fd..2b111213fff 100644
--- a/server/src/main/java/io/druid/segment/indexing/DataSchema.java
+++ b/server/src/main/java/io/druid/segment/indexing/DataSchema.java
@@ -85,7 +85,7 @@ public class DataSchema
       log.warn("No metricsSpec has been specified. Are you sure this is what you want?");
     }
 
-    this.aggregators = aggregators;
+    this.aggregators = aggregators == null ? new AggregatorFactory[]{} : aggregators;
   }
 
   @JsonProperty