Licht-T commented on PR #55610:
URL: https://github.com/apache/spark/pull/55610#issuecomment-4379856779

   @MaxGekk @cloud-fan friendly ping when you have a moment - this is a 
follow-up to [SPARK-33404](https://issues.apache.org/jira/browse/SPARK-33404) 
that you originally fixed and merged. The slow path you introduced for 
correctness is preserved as the fallback; the new fast path applies the offset 
before/after the floorMod and verifies the offset is unchanged at the truncated 
candidate, so the LMT minute case (and the SPARK-30766 / SPARK-30857 hour/day 
cases) all still go through the safe path. ~2× speedup on MINUTE/HOUR/DAY 
locally, which recovers most of the regression flagged in apache/spark#30338. 
Would appreciate your eyes.


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