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https://issues.apache.org/jira/browse/TAJO-838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14255535#comment-14255535
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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-67810694
While I'm testing, I feel that this work needs some documentation. Could
you add its documentation? Of course, I can find some semantic definition and
read examples in unit tests. But, it still requires documentation for users and
testers. In addition, we may mark it as 'experimental feature' in the
documentation.
> 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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