Github user adrian555 commented on a diff in the pull request:
https://github.com/apache/spark/pull/9031#discussion_r41698039
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1881,3 +1881,33 @@ setMethod("as.data.frame",
}
collect(x)
})
+
+#' The specified DataFrame is attached to the R search path. This means
that
+#' the DataFrame is searched by R when evaluating a variable, so columns in
+#' the DataFrame can be accessed by simply giving their names.
+#'
+#' @rdname attach
+#' @title Attach DataFrame to R search path
+#' @param what (DataFrame) The DataFrame to attach
+#' @param pos (integer) Specify position in search() where to attach.
+#' @param name (character) Name to use for the attached DataFrame. Names
+#' starting with package: are reserved for library.
+#' @param warn.conflicts (logical) If TRUE, warnings are printed about
conflicts
+#' from attaching the database, unless that DataFrame contains an object
+#' @examples
+#' \dontrun{
+#' attach(irisDf)
+#' summary(Sepal_Width)
+#' }
+#' @seealso \link{detach}
+setMethod("attach",
+ signature(what = "DataFrame"),
+ function(what, pos = 2, name = deparse(substitute(what)),
warn.conflicts = TRUE) {
+ bf <- what
+ cols <- columns(bf)
+ newEnv <- new.env()
+ for (i in 1:length(cols)) {
--- End diff --
@shivaram @felixcheung Anyone knows how to create a DataFrame with 0
column? Could you please show me how to do that? Thanks.
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