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

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069729#comment-14069729 ] 

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

Github user jihoonson commented on the pull request:

    https://github.com/apache/tajo/pull/85#issuecomment-49691875
  
    Sure. That is planed at TAJO-838 (https://issues.apache.org/jira/browse/TAJO-838).


> 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
>            Priority: Minor
>             Fix For: 0.9.0
>
>
> 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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