HyukjinKwon commented on a change in pull request #27433:
[SPARK-30682][SPARKR][SQL] Add SparkR interface for higher order functions
URL: https://github.com/apache/spark/pull/27433#discussion_r373895742
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File path: R/pkg/R/functions.R
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@@ -3281,6 +3322,126 @@ setMethod("row_number",
###################### Collection functions######################
+#' Create o.a.s.sql.expressions.UnresolvedNamedLambdaVariable,
+#' convert it to o.s.sql.Column and wrap with R Column.
+#' Used by higher order functions.
+#'
+#' @param ... character of length = 1
+#' if length(...) > 1 then argument is interpreted as a nested
+#' Column, for example \code{unresolved_named_lambda_var("a", "b", "c")}
+#' yields unresolved \code{a.b.c}
+#' @return Column object wrapping JVM UnresolvedNamedLambdaVariable
+unresolved_named_lambda_var <- function(...) {
+ jc <- sparkR.newJObject(
+ "org.apache.spark.sql.Column",
+ sparkR.newJObject(
Review comment:
I think we can just call `newJObject` within SparkR to be more consistent.
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