16pierre commented on issue #9846:
URL: https://github.com/apache/datafusion/issues/9846#issuecomment-2589918623

   > Adjusting heuristics will likely just make some people's plans better but 
others worse
   
   Yes, what I had in mind was to stay behind the `!prefer_hash_join` flag to 
use SMJ. 
   
   My blocker was rather the conditions 
`session_state.config().target_partitions() > 1 && 
session_state.config().repartition_joins()`, which I guess are required today 
to guarantee that data is pre-sorted correctly, whereas there may be other ways 
to infer that data is pre-sorted. But this probably not high priority, it's 
feasible to work-around as suggested in this thread.


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