Github user falaki commented on a diff in the pull request: https://github.com/apache/spark/pull/9218#discussion_r42785718 --- Diff: R/pkg/R/DataFrame.R --- @@ -276,6 +276,57 @@ setMethod("names<-", } }) +#' @rdname columns +#' @name colnames +setMethod("colnames", + signature(x = "DataFrame"), + function(x) { + columns(x) + }) + +#' @rdname columns +#' @name colnames<- +setMethod("colnames<-", + signature(x = "DataFrame", value = "character"), + function(x, value) { + sdf <- callJMethod(x@sdf, "toDF", as.list(value)) + dataFrame(sdf) + }) + +#' coltypes +#' +#' Set the column types of a DataFrame. +#' +#' @name coltypes +#' @param x (DataFrame) +#' @return value (character) A character vector with the target column types for the given DataFrame +#' @rdname coltypes +#' @aliases coltypes +#' @export +#' @examples +#'\dontrun{ +#' sc <- sparkR.init() +#' sqlContext <- sparkRSQL.init(sc) +#' path <- "path/to/file.json" +#' df <- jsonFile(sqlContext, path) +#' coltypes(df) <- c("string", "integer") +#'} +setMethod("coltypes<-", --- End diff -- Do you think users may expect ```coltypes``` in addition to ```coltypes<-```? I think having it would be nice.
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