thisisnic commented on PR #34050:
URL: https://github.com/apache/arrow/pull/34050#issuecomment-1436815827

   I figured a sensible approach to this PR is to write a test for the desired 
behaviour, and then implement something to make the test pass. I noticed other 
tests in a similar region of code seem to use this "Arrow -> serialize to 
Substrait -> deserialize to Arrow -> check things match" pattern.  However, on 
further inspection, it doesn't seem like a lot of 'Arrow -> Substrait' 
serialization is implemented.  Am I better off just manually specifying the 
plan using `SubstraitFromJSON()`, and testing I get the desired Arrow behaviour?


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