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https://issues.apache.org/jira/browse/PHOENIX-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387560#comment-14387560
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Alicia Ying Shu commented on PHOENIX-1580:
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[~maryannxue] Thanks a lot for the response. If I understand right we should
not use MergeSortTopNResultIterator if there is order by for Union all because
the first N results coming back are not the final results. We should have all
the results back and have a final Order by on them. Currently Order By and
Limit have been pushed down to each subSelect.
> 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.patch,
> phoenix-1580-v1-wipe.patch, phoenix-1580.patch, unionall-wipe.patch
>
>
> Select * from T1
> UNION ALL
> Select * from T2
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