Fokko commented on issue #37219:
URL: https://github.com/apache/arrow/issues/37219#issuecomment-1688941267

   Thanks @bkietz for the context and pointer. I was digging into the code, but 
was unable to see when the loop is actually executed. It seems that the size of 
`exprs` is always zero. I would except these tests to use the loop: 
https://github.com/apache/arrow/blob/b3936b9f0d0a899480741f2026c0349bf876c210/cpp/src/arrow/dataset/scanner_test.cc#L2060-L2062
   Would you have a few more pointers where you would look to implement this?


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