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https://issues.apache.org/jira/browse/PHOENIX-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14221599#comment-14221599
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Mujtaba Chohan commented on PHOENIX-1476:
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[~jamestaylor] Group by performance is back to normal with your patch.
> Immediately open scanner for parallel queries
> ---------------------------------------------
>
> Key: PHOENIX-1476
> URL: https://issues.apache.org/jira/browse/PHOENIX-1476
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Attachments: PHOENIX-1476.patch
>
>
> Seems like there may be a performance degradation of waiting to open the
> scanner for parallel queries. In particular GROUP BY queries.
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