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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/11/27 16:25:48 UTC

[GitHub] [arrow] jorgecarleitao commented on pull request #8785: ARROW-10729: [Rust] [DataFusion] Add SQL support for JOIN using implicit syntax [WIP]

jorgecarleitao commented on pull request #8785:
URL: https://github.com/apache/arrow/pull/8785#issuecomment-734907835


   Thanks @andygrove. 
   
   I am a bit confused: why is there a filter on the plan? I thought that the logical plan of 
   
   ```
   SELECT t1_id, t1_name, t2_name FROM t1, t2 WHERE t2_id = t1_id ORDER BY t1_id
   ```
   
   would not contain a filter, as `=` in `WHERE t2_id = t1_id` represents "equal under hashing on a join" (that is already represented on the `Join: t1_id = t2_id` bit of the plan.


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