2010YOUY01 commented on issue #15628:
URL: https://github.com/apache/datafusion/issues/15628#issuecomment-2814936184

   > [@alamb](https://github.com/alamb)
   > 
   > I think a SortMergeJoin derivative that handles inequality could be 
helpful here but there are comments that SortMergeJoin is not used in plans yet.
   > 
   > Is there a reason for this?
   
   The optimization to execute join conditions like `t1.id <= t2.id` 
efficiently with SMJ is not implemented yet, now SMJ can only handle an equal 
join condition (plus additional join conditions to be processed after the equal 
condition is evaluated)


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