nealrichardson commented on a change in pull request #9521:
URL: https://github.com/apache/arrow/pull/9521#discussion_r581423955
##########
File path: r/R/dplyr.R
##########
@@ -73,6 +80,22 @@ print.arrow_dplyr_query <- function(x, ...) {
invisible(x)
}
+get_field_names <- function(selected_cols) {
+ if (inherits(selected_cols, "arrow_dplyr_query")) {
+ selected_cols <- selected_cols$selected_columns
+ }
+ map_chr(selected_cols, ~.$field_name %||% .$args$field_name %||% "")
Review comment:
I can comment, though FWIW I'm pretty sure this will crash once dataset
expressions might not be field_refs (in the next PR) so it's likely to be
rewritten.
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