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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14254866#comment-14254866
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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-67743339
Hi @jihoonson,
This is a great work as well as a huge work. I almost finish the code
review. We discussed the code for long time. There still remain feature
reviews. I'll test features on a cluster. Then, I'll finish the review soon.
> 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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