Github user zero323 commented on a diff in the pull request:
https://github.com/apache/spark/pull/17783#discussion_r113772682
--- Diff: R/pkg/R/functions.R ---
@@ -3803,3 +3803,41 @@ setMethod("repeat_string",
jc <- callJStatic("org.apache.spark.sql.functions", "repeat",
x@jc, numToInt(n))
column(jc)
})
+#' not
+#'
+#' Inversion of boolean expression.
+#'
+#' \code{not} and \code{!} cannot be applied directly to numerical column.
+#' To achieve R-like truthiness column has to be casted to
\code{BooleanType}.
+#'
+#' @param x Column to compute on
+#' @rdname not
+#' @name not
+#' @aliases not,Column-method
+#' @export
+#' @examples \dontrun{
+#' df <- createDataFrame(data.frame(
+#' is_true = c(TRUE, FALSE, NA),
+#' flag = c(1, 0, 1)
+#' ))
+#'
+#' head(select(df, not(df$is_true)))
+#' ## (NOT is_true)
+#' ##1 FALSE
+#' ##2 TRUE
+#' ##3 NA
+#'
+#' # Explicit cast is required when working with numeric column
+#' head(select(df, not(cast(df$flag, "boolean"))))
+#' ## (NOT CAST(flag AS BOOLEAN))
+#' ## 1 FALSE
+#' ## 2 TRUE
+#' ## 3 FALSE
+#' }
+#' @note not since 2.3.0
+setMethod("not",
--- End diff --
It is, but `testthat::not` is deprecated anyway.
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