Jackie-Jiang commented on issue #11629:
URL: https://github.com/apache/pinot/issues/11629#issuecomment-1728657739

   That involves some implementation details. If the `CAST` is applied to a 
column (not aggregate function), it will be solved with 
`CastTransformFunction`, where the return type can be properly derived. If the 
`CAST` is applied to an aggregate function (we call it post-aggregation), it 
will be solved with scalar function (`DataTypeConversionFunctions.cast()`), 
where currently pinot cannot properly derive the result type


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