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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14272810#comment-14272810
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ASF GitHub Bot commented on TAJO-838:
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Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/231#issuecomment-69483361
@jihoonson ,
I agree with your plan. Even through this feature is still experimental, it
seems to be ready to merge this feature to master branch due to maintenance
cost. It also works well for CSV files.
> 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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