[GitHub] [arrow] nealrichardson commented on pull request #7524: ARROW-8899 [R] Add R metadata like pandas metadata for round-trip fidelity

[GitBox <gi...@apache.org>]

nealrichardson commented on pull request #7524:
URL: https://github.com/apache/arrow/pull/7524#issuecomment-650249655


   @romainfrancois regarding tests, I think a fixture something like 
   
   ```r
   df <- tibble::tibble(
     a = structure("one", class = "special_string"),
     b = 2,
     c = tibble::tibble(
       c1 = structure("inner", extra_attr = "something"),
       c2 = 4
     )
   )
   ```
   
   could be sufficient. 
   
   ```r
   expect_identical(as.data.frame(Table$create(df)), df)
   expect_identical(as.data.frame(record_batch(df)), df)
   ```
   
   and then also confirm that it's identical round-tripping to Feather and Parquet.


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