docs: remove broken $name$map's document

NEWS.md

@@ -30,6 +30,8 @@
   - The `check_sorted` argument is removed from `$rolling()` and `$group_by_dynamic()`.
     Sortedness is now verified in a quick manner, so this argument is no longer needed
     (pola-rs/polars#16494).
+  - `$name$map()` stacks on Linux, so this method is deprecated and the document
+    is removed. Please use other methods including `$rename_with()` instead (#1123).
 - As warned in v0.16.0, the order of arguments in `pl$Series` is changed (#1071).
   The first argument is now `name`, and the second argument is `values`.
 - `$to_struct()` on an Expr is removed. This method is now only available for

R/expr__name.R

@@ -49,6 +49,8 @@ ExprName_keep = function() {
     unwrap("in $name$keep():")
 }
 
+# TODO: this method is broken after <https://github.com/pola-rs/r-polars/pull/1104>, so not documented
+#' @noRd
 #' Map alias of expression with an R function
 #'
 #' Rename the output of an expression by mapping a function over the root name.
@@ -57,16 +59,16 @@ ExprName_keep = function() {
 #' @return Expr
 #'
 #' @examples
-#' # df = pl$DataFrame(var1 = 1:3, var2 = "a")
-#' #
-#' #  df$select(
-#' #    pl$col("*")$name$map(\(x) paste0("new_", x))
-#' #  )
-#' #
-#' #  # $alias() is not taken into account by $name$map()
-#' #  df$select(
-#' #    pl$col("var1")$alias("foobar")$name$map(\(x) paste0("new_", x))
-#' #  )
+#' df = pl$DataFrame(var1 = 1:3, var2 = "a")
+#'
+#' df$select(
+#'   pl$col("*")$name$map(\(x) paste0("new_", x))
+#' )
+#'
+#' # $alias() is not taken into account by $name$map()
+#' df$select(
+#'   pl$col("var1")$alias("foobar")$name$map(\(x) paste0("new_", x))
+#' )
 ExprName_map = function(fun) {
   if (
     !polars_options()$no_messages &&