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https://issues.apache.org/jira/browse/HIVE-28489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17894117#comment-17894117
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Stamatis Zampetakis commented on HIVE-28489:
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Hey [~seonggon], according to the [discussion in the user
list|https://lists.apache.org/thread/o2rm4xjmlfv7co2ort7o5tpg37bo5zhj] there
might be a new patch around this optimization. Is PR#5424 ready for review or
we should wait for another PR?
nit: I was checking the attached slides but given that I don't have Powerpoint
they appear somewhat broken in LibreOffice. Consider sharing such info in more
widespread formats such as pdf.
> Partitioning the input data of Grouping Set GroupBy operator
> ------------------------------------------------------------
>
> Key: HIVE-28489
> URL: https://issues.apache.org/jira/browse/HIVE-28489
> Project: Hive
> Issue Type: New Feature
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: pull-request-available
> Attachments: 2.PartitionDataBeforeGroupingSet.pptx
>
>
> GroupBy operator with grouping sets often emits too many rows, which becomes
> the bottleneck of query execution. To reduce the number output rows, this
> JIRA proposes partitioning the input data of such GroupBy operator.
> Please check out the attached slides for detailed explanation.
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