lidavidm commented on a change in pull request #10724:
URL: https://github.com/apache/arrow/pull/10724#discussion_r671402622
##########
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")
+ }
+
+ # TODO: if_else doesn't yet support factors/dictionaries this can be removed
when
+ # ARROW-13358 merges
+ warn_r_types <- is.factor(true) || is.factor(false)
+ # However, if they are expressions, we need to use the functions from
nse_funcs
+ warn_expression_types_true <- inherits(true, "Expression") &&
nse_funcs$is.factor(true)
+ warn_expression_types_false <- inherits(false, "Expression") &&
nse_funcs$is.factor(false)
+
+ if (warn_r_types | warn_expression_types_true | warn_expression_types_false)
{
+ warning("Factors are currently converted to chracters in if_else and
ifelse", call. = FALSE)
+ }
Review comment:
This is a more general issue (e.g. I believe all arithmetic kernels do
the same thing). However for those kernels it's more unavoidable; for if_else
and friends maybe we should implement specific dictionary handling.
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