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https://issues.apache.org/jira/browse/SPARK-11392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983490#comment-14983490
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Yin Huai commented on SPARK-11392:
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I think it is not necessary to revert that. But, we may want to update some
comments if the behavior of GroupedIterator's hasNext has been changed.
> 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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