[GitHub] [arrow] daattali opened a new issue, #34775: [R] arrow_table: as.data.frame() sometimes returns a tbl and sometimes a data.frame

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

daattali opened a new issue, #34775:
URL: https://github.com/apache/arrow/issues/34775

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   The documentation for `arrow_table()` says that you can call `as.data.frame()` on an arrow table object to convert it to a dataframe. It seems like the behaviour is inconsistent. Example:
   
   ```r
   > class(as.data.frame(arrow::arrow_table(name = "1", mtcars)))
   [1] "tbl_df"     "tbl"        "data.frame"
   > class(as.data.frame(arrow::arrow_table(mtcars, name = "1")))
   [1] "data.frame"
   ```
   
   I created the same arrow_table in both cases but only changed the order of the arguments, and it returned a different object type.
   
   I would expect it to be base R dataframe since `as.data.frame()` is a generic from base R that is generally assumed to convert to actual `data.frame` objects, not to tibbles. Right now if I want to guarantee a base R data.frame, I need to do `as.data.frame(as.data.frame(table))`. I need to ocnvert it using the same function twice, which is extremely awkward and unintuitive. I strongly believe arrow should not conflate `data.frame()` with `tbl_df`, it can cause errors for users.
   
   ### Component(s)
   
   R


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[GitHub] [arrow] thisisnic commented on issue #34775: [R] arrow_table: as.data.frame() sometimes returns a tbl and sometimes a data.frame

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

thisisnic commented on issue #34775:
URL: https://github.com/apache/arrow/issues/34775#issuecomment-1489786844

   Thanks for reporting this, I agree it's not intended behaviour.  Looks like it's something to do with how metadata is handled, will have a closer look at this.


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[GitHub] [arrow] thisisnic closed issue #34775: [R] arrow_table: as.data.frame() sometimes returns a tbl and sometimes a data.frame

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

thisisnic closed issue #34775: [R] arrow_table: as.data.frame() sometimes returns a tbl and sometimes a data.frame
URL: https://github.com/apache/arrow/issues/34775


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