Dandandan commented on PR #21479:
URL: https://github.com/apache/datafusion/pull/21479#issuecomment-4221809099

   `datafusion.optimizer.enable_window_topn`
   
   If it has regressions as large as `0.03x` it should off by default (and we 
should look if we can automatically enable it via a heuristic / stats based on 
partition cardinality / rows)


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