[GitHub] [arrow] thisisnic commented on issue #15247: [R] Error when trying to save a data.frame with NULL column names

["thisisnic (via GitHub)" <gi...@apache.org>]

thisisnic commented on issue #15247:
URL: https://github.com/apache/arrow/issues/15247#issuecomment-1415404352

   Thanks for reporting this @OfekShilon!
   
   I had a look at our other file writing functions to have a look at behaviour, and this isn't just restricted to those.  Interestingly, `readr::write_csv()` has the same behaviour.
   
   ``` r
   df <- data.frame(a=1:3,b=4:6)
   names(df) <- NULL
   arrow::write_feather(x=df, sink="~/tmp/df")
   #> Error: Invalid input type, expected 'character' actual 'NULL'
   arrow::write_csv_arrow(df, "tst.csv")
   #> Error in `value[[3L]]()`:
   #> ! x must be an object of class 'data.frame', 'RecordBatch', 'Dataset', 'Table', or 'RecordBatchReader' not 'data.frame'.
   
   #> Backtrace:
   #>     ▆
   #>  1. └─arrow::write_csv_arrow(df, "tst.csv")
   #>  2.   └─base::tryCatch(...)
   #>  3.     └─base (local) tryCatchList(expr, classes, parentenv, handlers)
   #>  4.       └─base (local) tryCatchOne(expr, names, parentenv, handlers[[1L]])
   #>  5.         └─value[[3L]](cond)
   #>  6.           └─rlang::abort(...)
   arrow::write_parquet(df, "tst.csv")
   #> Error: Invalid input type, expected 'character' actual 'NULL'
   
   readr::write_csv(df, "tst.csv")
   #> Error: Invalid input type, expected 'character' actual 'NULL'
   ```
   
   Can I ask a bit more about the use case here, and the circumstances in which it's desirable to have a `data.frame` with NULL column names?


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