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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14184048#comment-14184048
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ASF GitHub Bot commented on TAJO-838:
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Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/192#issuecomment-60477837
Thanks for your comment.
As you said, it will be interesting to evaluate the performance with
varying the selectivity.
But, I'm sorry to say that nowadays I have little time to perform
performance tests.
Maybe, I can do it next month. I'll share the test results as soon as
possible.
> 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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