[jira] [Created] (TAJO-775) Implement the physical executor for window aggregation

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-775:
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             Summary: Implement the physical executor for window aggregation
                 Key: TAJO-775
                 URL: https://issues.apache.org/jira/browse/TAJO-775
             Project: Tajo
          Issue Type: Sub-task
    Affects Versions: 0.9
            Reporter: Hyunsik Choi
             Fix For: 0.9


See the title. The objective of this issue is to create the window aggregation 
operator. I have a plan to implement the sort-based window aggregation 
operator. 

This operator will support multiple analytic functions with the same partition 
keys and same/different order-by keys in one query. But, it will not support 
the use of multiple analytic functions with different partitioning keys in the
same query. 



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