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https://issues.apache.org/jira/browse/SPARK-2657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14072608#comment-14072608
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Apache Spark commented on SPARK-2657:
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User 'mateiz' has created a pull request for this issue:
https://github.com/apache/spark/pull/1555
> Use more compact data structures than ArrayBuffer in groupBy and cogroup
> ------------------------------------------------------------------------
>
> Key: SPARK-2657
> URL: https://issues.apache.org/jira/browse/SPARK-2657
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Reporter: Matei Zaharia
> Assignee: Matei Zaharia
> Fix For: 1.1.0
>
>
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