jonkeane commented on a change in pull request #10724:
URL: https://github.com/apache/arrow/pull/10724#discussion_r671387944
##########
File path: r/R/dplyr-functions.R
##########
@@ -634,20 +634,45 @@ nse_funcs$wday <- function(x, label = FALSE, abbr = TRUE,
week_start = getOption
}
nse_funcs$log <- function(x, base = exp(1)) {
-
+
if (base == exp(1)) {
return(Expression$create("ln_checked", x))
}
-
+
if (base == 2) {
return(Expression$create("log2_checked", x))
}
-
+
if (base == 10) {
return(Expression$create("log10_checked", x))
- }
+ }
# ARROW-13345
stop("`base` values other than exp(1), 2 and 10 not supported in Arrow",
call. = FALSE)
}
nse_funcs$logb <- nse_funcs$log
+
+nse_funcs$if_else <- function(condition, true, false, missing = NULL){
+ if (!is.null(missing)) {
+ arrow_not_supported("missing argument")
Review comment:
It provides a value to be used if the `condition` is missing/NA:
```
> vec <- c(1, 2, NA, 3, 4)
> dplyr::if_else(vec < 4, "<4", ">=4", missing = "MISSING")
[1] "<4" "<4" "MISSING" "<4" ">=4"
```
Actually, we could support it now with a nested if_else... I'll work on that.
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