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Posted to dev@phoenix.apache.org by "James Taylor (JIRA)" <ji...@apache.org> on 2014/03/06 05:12:43 UTC
[jira] [Commented] (PHOENIX-114) Add Hints so that user can select
whether to use "avoid seek optimization" or not
[ https://issues.apache.org/jira/browse/PHOENIX-114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13921986#comment-13921986 ]
James Taylor commented on PHOENIX-114:
--------------------------------------
+1. Looks great. Thanks, [~anoop.hbase].
> 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
> 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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