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From "James Taylor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3591) Group by is slower for immutable encoded table
Date Mon, 06 Mar 2017 21:31:32 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898149#comment-15898149
] 

James Taylor commented on PHOENIX-3591:
---------------------------------------

[~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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