adriangb commented on PR #15568:
URL: https://github.com/apache/datafusion/pull/15568#issuecomment-2786429909

   My view for `DynamicFilterSource` is not that it's a public API in 
DataFusion. It's a private implementation detail / helper that internal 
implementations of dynamic `PhysicalExpr` can use to simplify implementing 
dynamic `PhysicalExpr` by making a `DynamicFilterSource` and wrapping it with 
`DynamicPhysicalExpr`. Maybe we expose it publically if there's enough demand 
for it but I think it'll be private to begin with.
   
   I realize this PR doesn't make that clear or structure the exports correctly 
atm. Probably makes sense for it to be a private module in the same crate as 
`HashJoinExec`, `SortExec`, etc. live.


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