alamb commented on PR #4280:
URL: 
https://github.com/apache/arrow-datafusion/pull/4280#issuecomment-1320853179

   So last night I realized that this PR likely broke predicate pushdown for 
certain predicates -- specifically since the pushdown filters are taken from 
the pruning predicate, by dropping the pruning predicate we will ensure no 
pushdown happens as the filter is no longer available.
   
   Rather than back this PR out, however, I think we should forge ahead with 
properly saving the original predicate, as I have done in 
https://github.com/apache/arrow-datafusion/pull/4279


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