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Posted to issues@tajo.apache.org by "Hyunsik Choi (JIRA)" <ji...@apache.org> on 2014/09/21 21:26:34 UTC

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

     [ https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyunsik Choi updated TAJO-838:
------------------------------
    Fix Version/s:     (was: 0.9.0)

> 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
>
> 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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