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https://issues.apache.org/jira/browse/PHOENIX-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14382099#comment-14382099
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Maryann Xue commented on PHOENIX-1580:
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[~ayingshu] Not sure about the UNION grammar about column names, does it
require columns have exactly the same names or aliases from each subquery? If
yes, pushing down ORDER BY would be just as fine.
It is important that we need to push down ORDER BY and LIMIT, because that way
we can leverage server sorting and return as few rows as possible from the
server.
> Support UNION ALL
> -----------------
>
> Key: PHOENIX-1580
> URL: https://issues.apache.org/jira/browse/PHOENIX-1580
> Project: Phoenix
> Issue Type: Bug
> Reporter: Alicia Ying Shu
> Assignee: Alicia Ying Shu
> Attachments: PHOENIX-1580-grammar.patch, phoenix-1580-v1-wipe.patch,
> phoenix-1580.patch, unionall-wipe.patch
>
>
> Select * from T1
> UNION ALL
> Select * from T2
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