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https://issues.apache.org/jira/browse/SPARK-9611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654490#comment-14654490
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Apache Spark commented on SPARK-9611:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/7948
> UnsafeFixedWidthAggregationMap.destructAndCreateExternalSorter will add an
> empty entry to if the map is empty.
> --------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-9611
> URL: https://issues.apache.org/jira/browse/SPARK-9611
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
> Priority: Blocker
> Fix For: 1.5.0
>
>
> There are two corner cases related to the destructAndCreateExternalSorter
> (class UnsafeKVExternalSorter) returned by UnsafeFixedWidthAggregationMap.
> 1. The constructor of UnsafeKVExternalSorter tries to first create a
> UnsafeInMemorySorter based on the BytesToBytesMap of
> UnsafeFixedWidthAggregationMap. However, when there is no entry in the map,
> UnsafeInMemorySorter will throw an AssertionError because we are using the
> size of map (0 at here) as the initialSize of UnsafeInMemorySorter, which is
> not allowed.
> 2. Once we fixes the first problem, when we use UnsafeKVExternalSorter's
> KVSorterIterator loads data back, you can find there is one extra records,
> which is an empty record.
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