mikamikasuki commented on PR #26043:
URL: https://github.com/apache/datafusion/pull/26043#issuecomment-6049280856

   Thanks for pointing out these gaps. I’ve updated this PR to fix the 
ordering/comparison mismatch directly:
   - < and <= keys sort DESC NULLS LAST, and the classic and left existence 
joins skip trailing NULL keys.
   - Nested min/max keys use Arrow’s comparator.
   - The streamed side uses lexsort_to_indices, covering Struct and 
List-of-List keys.
   I’ve also removed the nested-key fallback and added regression coverage 
against NestedLoopJoin. The local extended workspace tests and lint checks pass.


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