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https://issues.apache.org/jira/browse/PHOENIX-944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177881#comment-14177881
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James Taylor commented on PHOENIX-944:
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Maybe ClientAggregatingResultIterator, since it's usage is for client-side
aggregation, right?
> Support derived tables in FROM clause that needs extra steps of client-side
> aggregation or other processing
> -----------------------------------------------------------------------------------------------------------
>
> Key: PHOENIX-944
> URL: https://issues.apache.org/jira/browse/PHOENIX-944
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 3.0.0, 4.0.0, 5.0.0
> Reporter: Maryann Xue
> Assignee: Maryann Xue
> Fix For: 3.0.0, 4.0.0, 5.0.0
>
> Attachments: 944.patch
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Groupby in both outer and inner queries cannot be flattened. We can apply an
> extra step of client-side aggregation to handle such cases.
> See DerivedTableIT.java for all those examples that are currently not
> supported.
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