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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/11/04 06:59:00 UTC

[GitHub] [arrow-datafusion] mingmwang commented on pull request #3912: Expression boundary analysis framework

mingmwang commented on PR #3912:
URL: https://github.com/apache/arrow-datafusion/pull/3912#issuecomment-1303047208

   > 
   
   
   
   > We are also considering a range optimization on hash join, on queries like
   > 
   > ```sql
   > SELECT ...
   > FROM left, right
   > WHERE left.x > right.y AND
   > 		left.x + left.y < right.x + 10 AND
   > 		left.z = left.x
   > ```
   > 
   > and it paves the way for a streaming execution of the `HashJoinExec`. We’d like to collaborate on this PR. I guess a google doc would be the perfect medium to share ideas @isidentical.
   
   Why this SQL can run `HashJoinExec` ? Could you please explain a bit? Since there is no equal-join conditions, we can not derive any equal join conditions from the original expression either.


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