dwsmith1983 commented on PR #6041:
URL: 
https://github.com/apache/datafusion-comet/pull/6041#issuecomment-5750587636

   Pushed 674df28f4 after a closer read of 
`CollapseCodegenStages.supportCodegen`: a non-leaf `CodegenFallback` expression 
anywhere in the aggregate's expressions also turns codegen off, and Comet 
converts several of those natively (`filter(array(...), x -> ...)` for one), so 
the guard now mirrors that predicate. Tests cover both the result-expression 
and FILTER-clause shapes, plus ungrouped object hash aggregate and 
`SUM(DISTINCT)` coverage, and the compatibility note now names the two runtime 
fallbacks (`spark.sql.codegen.fallback`, `spark.sql.codegen.hugeMethodLimit`) 
that a plan-time guard cannot see. `CometAggregateSuite` and 
`CometWindowExecSuite` pass on Spark 3.5, and the change compiles against 4.0.
   


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