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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