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Posted to issues@tajo.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2014/11/09 15:35:33 UTC

[jira] [Commented] (TAJO-838) Improve query planner to utilize index

    [ https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14203934#comment-14203934 ] 

ASF GitHub Bot commented on TAJO-838:
-------------------------------------

Github user jihoonson closed the pull request at:

    https://github.com/apache/tajo/pull/192


> Improve query planner to utilize index
> --------------------------------------
>
>                 Key: TAJO-838
>                 URL: https://issues.apache.org/jira/browse/TAJO-838
>             Project: Tajo
>          Issue Type: Sub-task
>          Components: planner/optimizer
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>            Priority: Minor
>
> Index can improve the query performance when the selectivity of query is high.
> Thus, query planner should decide whether index is used or not for a given query.
> The selectivity can be guessed using statistics.



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