bvolpato commented on PR #22664:
URL: https://github.com/apache/datafusion/pull/22664#issuecomment-5464290835

   @gabotechs, would you have some time to review this one?
   
   it fixes two cases where Substrait round-trips silently change window 
semantics (`IGNORE NULLS` and interval `RANGE` frames). unsupported cases now 
fail explicitly instead of returning different results, and `DISTINCT` 
round-trips correctly.


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