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https://issues.apache.org/jira/browse/PHOENIX-3591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898149#comment-15898149
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James Taylor commented on PHOENIX-3591:
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[~mujtabachohan] - is this essentially an issue that will be covered by
documentation on when to use the column encoding feature?
> Group by is slower for immutable encoded table
> ----------------------------------------------
>
> Key: PHOENIX-3591
> URL: https://issues.apache.org/jira/browse/PHOENIX-3591
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Mujtaba Chohan
> Assignee: Samarth Jain
>
> {noformat}
> select /*+ SERIAL NO_CACHE*/ c0,sum(k1) from $T group by c0
> {noformat}
> This is >2X slower when compared to non-encoded table. There are 100 distinct
> values in c0 column.
> For data and schema see data generator script in
> https://issues.apache.org/jira/browse/PHOENIX-3560
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