adriangb commented on PR #16445:
URL: https://github.com/apache/datafusion/pull/16445#issuecomment-2989099023

   > I think it also makes sense to also thing about a heuristic we want to use 
to use this pushdown only when we think it might be useful - e.g. the left side 
is much smaller than the right side, or we know (based on column statistics) it 
will filter out rows
   
   Datafusion is generally _not great_ at these things: we often don't have 
enough stats / info to make decisions like this.


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