jayzhan211 commented on PR #26228:
URL: https://github.com/apache/datafusion/pull/26228#issuecomment-6244057352

   Could the NOT IN join use the null-aware RightAnti from #23957 instead? Then 
the broadcast subquery is the build side and Spark's streamed side is the probe 
side. The probe order is already declared through maintains_input_order, so 
Comet wouldn't need any build-side promise. It would also stop building the 
hash table from the whole streamed partition. The one limit is that it doesn't 
accept a join filter.


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