xiangfu0 commented on PR #19647:
URL: https://github.com/apache/pinot/pull/19647#issuecomment-6304333728

   Closing in favor of the existing aggregate rewrite framework: 
`AggregateFunctionRewriteOptimizer` (single-stage) and 
`PinotAggregateFunctionRewriteRule` (multi-stage). Type-dependent aggregates 
will be rewritten to explicit-type forms such as `FIRST_WITH_TIME(value, time, 
'TYPE')`, which carry the type in the call itself, so no new request or plan 
metadata is needed. Follow-up PRs will add these rewrites one aggregate family 
at a time.


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