raulcd commented on PR #46566:
URL: https://github.com/apache/arrow/pull/46566#issuecomment-2918696771

   I am no expert on this area.
   I agree with you that the the test you shared seems to return an unexpected 
behaviour. I would expect the filter to be correctly applied.
   Having said that I don't think the issue is coming from the code you have 
linked on `acero/hash_join_node.cc::CollectFilterColumns`, from my 
understanding this is the expected behavior. This isn't checking whether there 
are repeated fields on both schemas, is checking whether the filter field is in 
both schemas in order to avoid ambiguous filter expressions. cc @zanmato1984 
@pitrou which have more knowledge around this and can help understand it better 
and can validate whether the test is related to a possible bug on right outer 
join.


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