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https://issues.apache.org/jira/browse/PHOENIX-944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14179271#comment-14179271
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Maryann Xue commented on PHOENIX-944:
-------------------------------------
getGroupingKey(Tuple tuple, ImmutableBytesWritable ptr) actually takes in a
"ImmutableBytesWritable", so I assume there will be no byte copy and just some
reference copy, right? besides, this key will be part of the result tuple aside
from being used for the key comparison.
> 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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