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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