sarutak commented on PR #59940:
URL: https://github.com/apache/spark/pull/59940#issuecomment-6521593524

   Thank you for the careful review, @dongjoon-hyun. I pushed 142312384bd for 
the comments; replies are inline. In short: the projection split no longer 
holds conditions back across passes, but keeps the filter as written when a 
condition held back is rejected by the check, i.e. can fail or is 
non-deterministic (items 1, 3, 5, 8); conditions are no longer held back behind 
a scalar Python UDF (item 2); `Size` and numeric widening casts are in the 
allowlist (item 4); and the description now says this targets 4.4 first (item 
6).


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