Yin Huai created SPARK-11392:
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Summary: GroupedIterator's hasNext is not idempotent
Key: SPARK-11392
URL: https://issues.apache.org/jira/browse/SPARK-11392
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Yin Huai
If we call
[GroupedIterator|https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/GroupedIterator.scala]'s
{{hasNext}} immediately after its {{next}}, we will generate an extra group
([CoGroupedIterator|https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/CoGroupedIterator.scala]
has this behavior).
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