nealrichardson commented on PR #12826:
URL: https://github.com/apache/arrow/pull/12826#issuecomment-1189322402

   Re: the print method, you probably need more special casing 
[here](https://github.com/apache/arrow/blob/master/r/R/dplyr.R#L117). The other 
place that may make assumptions about FieldRefs is `implicit_schema()`, which 
is called when a query is collapsed. So you may want to add some tests that do 
aggregation, or joins, or head/tail, etc., as these are all cases that would 
involve implicit_schema (iirc). 
   
   Re: handling for non-Datasets, ideally you'd catch that when 
`add_filename()` is called. You should be able to find `.data` somewhere in the 
env stack and inspect it.


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