[jira] [Created] (TAJO-1665) Implement COLLECT_SET function

[Jaehwa Jung (JIRA)]

Jaehwa Jung created TAJO-1665:
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             Summary: Implement COLLECT_SET function
                 Key: TAJO-1665
                 URL: https://issues.apache.org/jira/browse/TAJO-1665
             Project: Tajo
          Issue Type: Improvement
          Components: function/udf
            Reporter: Jaehwa Jung


Implement COLLECT_SET() function that returns a set of objects with duplicate 
elements eliminated.

For the reference, it is one of hive built-in aggregation functions(UDAF).




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