cloud-fan commented on PR #47388:
URL: https://github.com/apache/spark/pull/47388#issuecomment-2249474014

   To extend it a bit more, shall we allow `where func(T_inner.x) = 
T_outer.date group by T_inner.x` if the `func` guarantees to produce different 
results for different values of `T_inner.x`?


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