From d0b849473567755aff734a2c2d771b762cc20073 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Xavier=20L=C3=A9aut=C3=A9?= <xavier@metamarkets.com>
Date: Tue, 1 Jul 2014 16:13:00 -0700
Subject: [PATCH] fix approximate histogram serde to not change buffer limit

---
 .../histogram/ApproximateHistogramFoldingSerde.java          | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramFoldingSerde.java b/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramFoldingSerde.java
index 196a1e50548..d7b988792bc 100644
--- a/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramFoldingSerde.java
+++ b/histogram/src/main/java/io/druid/query/aggregation/histogram/ApproximateHistogramFoldingSerde.java
@@ -110,8 +110,9 @@ public class ApproximateHistogramFoldingSerde extends ComplexMetricSerde
       @Override
       public ApproximateHistogram fromByteBuffer(ByteBuffer buffer, int numBytes)
       {
-        buffer.limit(buffer.position() + numBytes);
-        return ApproximateHistogram.fromBytes(buffer);
+        final ByteBuffer readOnlyBuffer = buffer.asReadOnlyBuffer();
+        readOnlyBuffer.limit(readOnlyBuffer.position() + numBytes);
+        return ApproximateHistogram.fromBytes(readOnlyBuffer);
       }
 
       @Override