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https://issues.apache.org/jira/browse/PHOENIX-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14390184#comment-14390184
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James Taylor commented on PHOENIX-1580:
---------------------------------------

bq. I have to say if we have taken my very early approach of passing down 
rowProjector, we can simplify the approach quite bit. 
I think what you meant to say was thank you so much [~maryannxue] for all your 
help in getting this UNION ALL implementation closer to something that actually 
works and will scale beyond a few thousand rows.

> 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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