[jira] [Created] (TAJO-950) Add distinct sort feature to sort operators

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-950:
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             Summary: 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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