[jira] [Created] (SPARK-19882) Pivot with null as the pivot value throws NPE

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

Hyukjin Kwon created SPARK-19882:
------------------------------------

             Summary: Pivot with null as the pivot value throws NPE
                 Key: SPARK-19882
                 URL: https://issues.apache.org/jira/browse/SPARK-19882
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Hyukjin Kwon


This seems a regression.

- Spark 1.6

{code}
Seq(Tuple1(None), Tuple1(Some(1))).toDF("a").groupBy($"a").pivot("a").count().show()
{code}

prints

{code}
+----+----+---+
|   a|null|  1|
+----+----+---+
|null|   0|  0|
|   1|   0|  1|
+----+----+---+
{code}


Current master

{code}
Seq(Tuple1(None), Tuple1(Some(1))).toDF("a").groupBy($"a").pivot("a").count().show()
{code}

prints

{code}
java.lang.NullPointerException was thrown.
java.lang.NullPointerException
  at org.apache.spark.sql.catalyst.expressions.aggregate.PivotFirst$$anonfun$4.apply(PivotFirst.scala:145)
  at org.apache.spark.sql.catalyst.expressions.aggregate.PivotFirst$$anonfun$4.apply(PivotFirst.scala:143)
  at scala.collection.immutable.List.map(List.scala:273)
  at org.apache.spark.sql.catalyst.expressions.aggregate.PivotFirst.<init>(PivotFirst.scala:143)
  at org.apache.spark.sql.catalyst.analysis.Analyzer$ResolvePivot$$anonfun$apply$7$$anonfun$24.apply(Analyzer.scala:509)
{code}




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