[ARROW-18199] [R] Misleading error message in query using across()

• Type: Sub-task
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Component/s: R
• External issue URL: https://github.com/apache/arrow/issues/33385
• Assignee: Unassigned
• Reporter: Nicola Crane
• Created: 31/Oct/22 13:53
• Updated: 11/Jan/23 11:58

Description

Error handling looks like it's happening in the wrong place - a comma has been missed in the select() but it's wrongly appearing like it's an issue with across(). Can we do something to make this not happen?

download.file(
  url = "https://github.com/djnavarro/arrow-user2022/releases/download/v0.1/nyc-taxi-tiny.zip",
  destfile = here::here("data/nyc-taxi-tiny.zip")
)

library(arrow)
library(dplyr)

open_dataset("data") %>%
  select(pickup_datetime, pickup_longitude, pickup_latitude ends_with("amount")) %>%
  mutate(across(ends_with("amount"), ~.x * 0.87, .names = "{.col}_gbp")) %>%
  collect()

Error in `across()`:
! Must be used inside dplyr verbs.
Run `rlang::last_error()` to see where the error occurred.