Aman Sinha created IMPALA-10619:
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             Summary: Enable external FE to leverage standardization of 
first_value/last_value functions
                 Key: IMPALA-10619
                 URL: https://issues.apache.org/jira/browse/IMPALA-10619
             Project: IMPALA
          Issue Type: Sub-task
          Components: Frontend
            Reporter: Aman Sinha
            Assignee: Aman Sinha


The FIRST_VALUE, LAST _VALUE functions go through standardization process in 
AnalyticExpr where they may be rewritten with different number of parameters or 
with different window frame.  In order for an external FE to leverage this 
standardization, some minor changes are needed to allow overriding of creation 
of a FunctionCallExpr.



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