stuhood opened a new pull request, #21267:
URL: https://github.com/apache/datafusion/pull/21267

   ## Which issue does this PR close?
   
   - Closes #20443.
   
   ## Rationale for this change
   
   This change fixes #20443, and adds support for generating dynamic filters 
for the left and right sides of a `SortMergeJoin`, in order to allow for 
range-based pruning of both sides of the join. Some consumers of the dynamic 
filter may even be able to seek/skip ahead on their inputs.
   
   ## What changes are included in this PR?
   
   To allow `SortMergeJoin` to actually propagate dynamic filters down to scans 
and get things working end to end, it was necessary to fix the 
`handle_child_pushdown_result` implementations of a variety of nodes which were 
failing to clone and update themselves.
   
   ## Are these changes tested?
   
   Yes.
   
   ## Are there any user-facing changes?
   
   Explain will now show dynamic filters for `SortMergeJoin`, and for the scans 
that they consume.
   


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