[GitHub] [arrow] thisisnic commented on pull request #12826: ARROW-15260: [R] open_dataset - add file_name as column

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

thisisnic commented on PR #12826:
URL: https://github.com/apache/arrow/pull/12826#issuecomment-1091812413

   Currently this fails with this error:
   
   ```
   Error in `handle_csv_read_error()` at r/R/dplyr-collect.R:33:6:
   ! Invalid: No match for FieldRef.Name(__filename) in int: int32
   dbl: double
   lgl: bool
   chr: string
   fct: dictionary<values=string, indices=int32, ordered=0>
   ts: timestamp[us, tz=UTC]
   group: int32
   other: string
   ```
   I think it's something to do with the fact that the new column is not in the schema; if I try to print the `arrow_dplyr_query` object before I collect, I get:
   
   ```
   Error in schm$GetFieldByName(name)$type$ToString() : 
     attempt to apply non-function
   ```
   
   Which appears to come from here: https://github.com/apache/arrow/blob/dd4215573349d10f7af9a1d0f316bfcc51b991e0/r/R/dplyr.R#L97


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