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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2016/09/23 00:09:20 UTC
[jira] [Created] (SPARK-17641) collect_set should ignore null values

Xiangrui Meng created SPARK-17641:
-------------------------------------

             Summary: collect_set should ignore null values
                 Key: SPARK-17641
                 URL: https://issues.apache.org/jira/browse/SPARK-17641
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Xiangrui Meng


`collect_set` throws the following exception when there are null values. It should ignore null values to be consistent with other aggregation methods.

{code}
java.lang.IllegalArgumentException: Flat hash tables cannot contain null elements.
	at scala.collection.mutable.FlatHashTable$HashUtils$class.elemHashCode(FlatHashTable.scala:390)
	at scala.collection.mutable.HashSet.elemHashCode(HashSet.scala:41)
	at scala.collection.mutable.FlatHashTable$class.addEntry(FlatHashTable.scala:136)
	at scala.collection.mutable.HashSet.addEntry(HashSet.scala:41)
	at scala.collection.mutable.HashSet.$plus$eq(HashSet.scala:60)
	at scala.collection.mutable.HashSet.$plus$eq(HashSet.scala:41)
	at org.apache.spark.sql.catalyst.expressions.aggregate.Collect.update(collect.scala:64)
	at org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$1$$anonfun$applyOrElse$1.apply(AggregationIterator.scala:170)
	at org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$1$$anonfun$applyOrElse$1.apply(AggregationIterator.scala:170)
	at org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$generateProcessRow$1.apply(AggregationIterator.scala:186)
	at org.apache.spark.sql.execution.aggregate.AggregationIterator$$anonfun$generateProcessRow$1.apply(AggregationIterator.scala:180)
	at org.apache.spark.sql.execution.aggregate.SortBasedAggregationIterator.processCurrentSortedGroup(SortBasedAggregationIterator.scala:115)
	at org.apache.spark.sql.execution.aggregate.SortBasedAggregationIterator.next(SortBasedAggregationIterator.scala:150)
	at org.apache.spark.sql.execution.aggregate.SortBasedAggregationIterator.next(SortBasedAggregationIterator.scala:29)
	at org.apache.spark.sql.execution.SparkPlan$$anonfun$3.apply(SparkPlan.scala:232)
	at org.apache.spark.sql.execution.SparkPlan$$anonfun$3.apply(SparkPlan.scala:225)
{code}



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