xiedeyantu commented on PR #4652:
URL: https://github.com/apache/calcite/pull/4652#issuecomment-3599354712

   > I am not very sure how this will be used, but this looks fine. You are not 
covering all existing RelNode types yet.
   
   This JIRA requirement originates from 
[CALCITE-5740](https://issues.apache.org/jira/browse/CALCITE-5740), aiming to 
more accurately determine which columns from child nodes are actually utilized 
by parent nodes, thereby facilitating the judgment of whether a conversion to 
semi-join is possible.


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