jackkleeman opened a new pull request, #20192:
URL: https://github.com/apache/datafusion/pull/20192

   ## Which issue does this PR close?
   
   Solves the simplest possible subset of #16973
   
   ## Rationale for this change
   
   Parent dynamic filters can be assessed for pushdown in much the same way at 
parent static filters. The essence of it is that you can push a filter into the 
probe side if the filter only refers to probe side columns. This PR makes no 
attempt to cover other cases (eg build side filters or the self filters that 
hashjoin creates)
   
   ## What changes are included in this PR?
   
   1. Allow a subset of parent dynamic filters for all join types except full 
depending on lr_is_preserved and which columns they refer to
   2. Sql logic tests for the above 
   3. New helper `ChildFilterDescription::all_unsupported`
   
   ## Are these changes tested?
   
   Yes
   
   ## Are there any user-facing changes?
   
   No
   
   


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