ctagard commented on PR #59403:
URL: https://github.com/apache/spark/pull/59403#issuecomment-6170411311

   Hey @HyukjinKwon, thank you so much for your detailed feedback! I 
implemented a fix for the blocker, the IN / NOT IN subqueries over a normalized 
key skip join-key normalization. I reproduced the issue, and followed your 
suggestion by updating NormalizeFloatingNumbers which now checks the keys on 
both sides, in both the equip-join case and the null-aware anti join case. 
   
   Already normalized keys are left as is, so only the subquery side gets 
wrapped. I fixed it there rather than adding InSubquery to the exemption in 
normalizeGroupingExpressions because the exemption would not cover a computed 
grouping key used as the IN value, and the rule-level fix also covers any other 
one-sided tag. Added tests to both the NormalizeFloatingPointNumbersSuite and 
the DataFrameAggregateSuite. 
   
   Looking forward to any more feedback!


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