From 49050a8d57c22d7a536eff025509f84005b95079 Mon Sep 17 00:00:00 2001
From: Michael Armbrust <michael@databricks.com>
Date: Tue, 29 Jul 2014 20:16:17 -0700
Subject: [PATCH] Handle null values in debug()

---
 .../scala/org/apache/spark/sql/execution/debug/package.scala  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala
index c6fbd6d2f693..cd056d98e376 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala
@@ -107,7 +107,9 @@ package object debug {
             var i = 0
             while (i < numColumns) {
               val value = currentRow(i)
-              columnStats(i).elementTypes += HashSet(value.getClass.getName)
+              if (value != null) {
+                columnStats(i).elementTypes += HashSet(value.getClass.getName)
+              }
               i += 1
             }
             currentRow