pjmore commented on issue #1612:
URL: 
https://github.com/apache/arrow-datafusion/issues/1612#issuecomment-1016970108


   
[This](https://github.com/pjmore/arrow-datafusion/blob/1acd0869ed1881577018ba3a4654a48fcf7a77bb/datafusion/src/optimizer/cross_join_elimination.rs)
 might make a good jumping off point. I'm pretty sure that one of the matches 
on the Eq operator `find_join_and_replace_join_keys_rec`  is wrong though.


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