thisisnic commented on code in PR #14093:
URL: https://github.com/apache/arrow/pull/14093#discussion_r1064476780
##########
r/R/dplyr-funcs-datetime.R:
##########
@@ -429,6 +430,78 @@ register_bindings_datetime_conversion <- function() {
})
}
+register_bindings_datetime_timezone <- function() {
+ register_binding(
+ "lubridate::force_tz",
+ function(time, tzone = "", roll_dst = c("error", "post")) {
+ if (length(roll_dst) == 1L) {
+ roll_dst <- c(roll_dst, roll_dst)
+ } else if (length(roll_dst) != 2L) {
+ arrow_not_supported("`roll_dst` length != 1 or 2")
+ }
+
+ nonexistent <- switch(
+ roll_dst[1],
+ "error" = 0L,
+ "boundary" = 2L,
+ arrow_not_supported("`roll_dst` != 'error' or 'boundary' for
nonexistent times")
Review Comment:
```suggestion
arrow_not_supported("`roll_dst` value must be 'error' or 'boundary'
for non-existent times; other values")
```
##########
r/R/dplyr-funcs-datetime.R:
##########
@@ -429,6 +430,78 @@ register_bindings_datetime_conversion <- function() {
})
}
+register_bindings_datetime_timezone <- function() {
+ register_binding(
+ "lubridate::force_tz",
+ function(time, tzone = "", roll_dst = c("error", "post")) {
+ if (length(roll_dst) == 1L) {
+ roll_dst <- c(roll_dst, roll_dst)
+ } else if (length(roll_dst) != 2L) {
+ arrow_not_supported("`roll_dst` length != 1 or 2")
+ }
+
+ nonexistent <- switch(
+ roll_dst[1],
+ "error" = 0L,
+ "boundary" = 2L,
+ arrow_not_supported("`roll_dst` != 'error' or 'boundary' for
nonexistent times")
+ )
+
+ ambiguous <- switch(
+ roll_dst[2],
+ "error" = 0L,
+ "pre" = 1L,
+ "post" = 2L,
+ arrow_not_supported("`roll_dst` != 'error', 'pre', or 'post' for
ambiguous times")
Review Comment:
This one too
##########
r/R/dplyr-funcs-datetime.R:
##########
@@ -429,6 +430,78 @@ register_bindings_datetime_conversion <- function() {
})
}
+register_bindings_datetime_timezone <- function() {
+ register_binding(
+ "lubridate::force_tz",
+ function(time, tzone = "", roll_dst = c("error", "post")) {
+ if (length(roll_dst) == 1L) {
+ roll_dst <- c(roll_dst, roll_dst)
+ } else if (length(roll_dst) != 2L) {
+ arrow_not_supported("`roll_dst` length != 1 or 2")
Review Comment:
```suggestion
arrow_not_supported("`roll_dst` must be 1 or 2 items long; other
lengths")
```
This phrasing could be a bit clearer here - I've updated this to be more
descriptive, and use "must" phrasing, as per the tidyverse style guide.
##########
r/R/dplyr-funcs-datetime.R:
##########
@@ -429,6 +430,78 @@ register_bindings_datetime_conversion <- function() {
})
}
+register_bindings_datetime_timezone <- function() {
+ register_binding(
+ "lubridate::force_tz",
+ function(time, tzone = "", roll_dst = c("error", "post")) {
+ if (length(roll_dst) == 1L) {
+ roll_dst <- c(roll_dst, roll_dst)
+ } else if (length(roll_dst) != 2L) {
+ arrow_not_supported("`roll_dst` length != 1 or 2")
+ }
+
+ nonexistent <- switch(
+ roll_dst[1],
+ "error" = 0L,
+ "boundary" = 2L,
+ arrow_not_supported("`roll_dst` != 'error' or 'boundary' for
nonexistent times")
+ )
+
+ ambiguous <- switch(
+ roll_dst[2],
+ "error" = 0L,
+ "pre" = 1L,
+ "post" = 2L,
+ arrow_not_supported("`roll_dst` != 'error', 'pre', or 'post' for
ambiguous times")
+ )
+
+ if (identical(tzone, "")) {
+ tzone <- Sys.timezone()
+ }
+
+ if (!inherits(time, "Expression")) {
+ time <- Expression$scalar(time)
+ }
+
+ # Non-UTC timezones don't work here and getting them to do so was too
+ # hard to do in the initial PR because there is no way in Arrow to
+ # "unapply" a UTC offset (i.e., the reverse of assume_timezone).
+ if (!time$type()$timezone() %in% c("", "UTC")) {
+ arrow_not_supported(
+ paste0("force_tz() from timezone `", time$type()$timezone(), "`")
+ )
Review Comment:
Please can we add something mentioning the fact that UTC timezones *are*
supported to this error message, so it's clearer to users what they can and
can't do?
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