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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/10/29 17:31:49 UTC

[GitHub] [arrow-datafusion] Dandandan commented on pull request #4011: Add right anti join support and support it in HashBuildProbeOrder

Dandandan commented on PR #4011:
URL: https://github.com/apache/arrow-datafusion/pull/4011#issuecomment-1295911256

   > How about we add Integration test about Join? I find there is just inner join in it.
   
   You mean with SQL tests, ir something else? Semi and anti joins don't have specific syntax currently, but are used for correlated subqueries,  `EXISTS`, etc.
   
   The right semi and right Anti are not used that often as they depend on statistics to be available. In Ballista I recently added support for a simple version of adaptive query execution. Now joins are reordered based on statistics that are collected when each stage has finished.


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