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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-114) Add Hints so that user can select whether to use "avoid seek optimization" or not
Date Thu, 06 Mar 2014 04:33:46 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13922000#comment-13922000
] 

Anoop Sam John commented on PHOENIX-114:
----------------------------------------

Thanks James for the quick review.

> Add Hints so that user can select whether to use "avoid seek optimization" or not
> ---------------------------------------------------------------------------------
>
>                 Key: PHOENIX-114
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-114
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 3.0.0
>
>         Attachments: PHOENIX-114.patch
>
>
> PHOENIX-29 added a new optimization in which we wont use HBase side ExplicitColumnTracker
and seeks to columns (When query selects selective columns). This will be useful when there
are less number of columns/versions whic are excluded.  But when there are many column/versions
which can be skipped (If the seeks can jump over some HFile blocks) the old way will be better.
> This issue adds two Hints in select for the user to explicitely tell whether to use the
column seek model or non seek model



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