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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2014/05/21 06:58:37 UTC

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

Jihoon Son created TAJO-838:
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             Summary: Improve query planner to utilize index
                 Key: TAJO-838
                 URL: https://issues.apache.org/jira/browse/TAJO-838
             Project: Tajo
          Issue Type: 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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