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https://issues.apache.org/jira/browse/TAJO-950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317649#comment-14317649
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Jihoon Son commented on TAJO-950:
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How about register this issue for GSocS 2015?
> Add distinct sort feature to sort operators
> -------------------------------------------
>
> Key: TAJO-950
> URL: https://issues.apache.org/jira/browse/TAJO-950
> Project: Tajo
> Issue Type: Improvement
> Components: physical operator
> Reporter: Hyunsik Choi
>
> Distinct sort physical operators are useful for 'SELECT DISTINCT' and some
> distinct aggregation statements. This feature enables the operator to
> eliminate the rows which have duplicated sort keys while sorting. It is very
> effective to reduce intermediate data, especially in the case where there are
> many duplicated sort keys.
> We need this feature. In terms of implementation approach, I'm expecting that
> distinct sort would be a flag for existing sort operators.
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