thisisnic commented on code in PR #51392:
URL: https://github.com/apache/arrow/pull/51392#discussion_r4082452841
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r/R/dplyr-funcs-augmented.R:
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@@ -18,27 +18,42 @@
#' Add the data filename as a column
#'
#' This function only exists inside `arrow` `dplyr` queries, and it only is
-#' valid when querying on a `FileSystemDataset`.
+#' valid when querying on a `FileSystemDataset`, such as one created by
+#' [open_dataset()]. Use it inside `mutate()` to add a column holding the path
+#' of the file each row was read from.
#'
-#' To use filenames generated by this function in subsequent pipeline steps,
you
-#' must either call \code{\link[dplyr:compute]{compute()}} or
-#' \code{\link[dplyr:collect]{collect()}} first. See Examples.
+#' The filename column can be used in later `select()`, `arrange()` and
+#' `group_by()` steps of the same query. However, it can't be used in
+#' `filter()`, and some functions (such as `substr()`) are not supported on it.
+#' In these cases, call \code{\link[dplyr:compute]{compute()}} or
+#' \code{\link[dplyr:collect]{collect()}} first. `add_filename()` must also be
Review Comment:
Good point, have updated
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