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https://issues.apache.org/jira/browse/SPARK-17641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Spark reassigned SPARK-17641:
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Assignee: (was: Apache Spark)
> 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}
> select collect_set(null) from (select 1) tmp;
> 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}
> cc: [~yhuai]
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