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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/12/24 16:36:26 UTC

[GitHub] [arrow] Dandandan edited a comment on pull request #9007: ARROW-11029: [Rust] [DataFusion] Improve join order optimization

Dandandan edited a comment on pull request #9007:
URL: https://github.com/apache/arrow/pull/9007#issuecomment-750923525


   I think we need better estimates for how many rows are filtered in a `WHERE` clause (for which we need the column level statistics). 
   
   Currently, the reordering on TPC-H q12 is not applied, because the (very selective) `Filter` which returns the unknown estimate.
   
   Did you run it with the order reversed / the optimization applied? I think it might actually be slower that way, because of the selective filter that can be pushed down (not 100% sure though)?


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