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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/11/18 04:39:13 UTC

[GitHub] [arrow-datafusion] jackwener commented on pull request #4185: Add rule to reimplement `Eliminate cross join` and remove it in planner

jackwener commented on PR #4185:
URL: https://github.com/apache/arrow-datafusion/pull/4185#issuecomment-1319533954

   > There is specific logic in `extract_possible_join_keys()` to handle and pull up common Exprs in the Or branches. But I think this logic should be handled in a common rule like `ExprSimplifier`. @alamb Once we reach the other rules, Exprs in Filters or Join conditions should be the already simplified form.
   > 
   > ```
   > (A.a = B.b and B.x = xxx) or (A.a = B.b and B.y = yyy)
   > ```
   > 
   > To
   > 
   > ```
   > (A.a = B.b) and (B.x = xxx or B.y = yyy)
   > ```
   
   Nice idea👍! It's a great future ticket.


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