mayankshriv opened a new issue #5261: Supporting complex aggregation functions
URL: https://github.com/apache/incubator-pinot/issues/5261
 
 
   Today, almost all aggregation functions take a single argument (except 
Distinct). We need to be able to support more complex aggregation functions 
such as:
   
   1. Aggregation functions with multiple arguments, for example:
      `ThetaSketch(expr1, expr2..., exprN): where exprN is the final set 
operation to evaluate, and expr1 through exprN-1 are terms in exprN` (more on 
this separately).
   
   2. Composite aggregation functions such as:
       `sum(colA) + sum(colB)`
   
   This requires us to rethink the AggregationFunction interface that is 
generic enough to support all such requirements.

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