Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/9613#discussion_r44867056
--- Diff: R/pkg/R/DataFrame.R ---
@@ -2200,4 +2200,101 @@ setMethod("coltypes",
rTypes[naIndices] <- types[naIndices]
rTypes
+ })
+
+#' Display the structure of a DataFrame, including column names, column
types, as well as a
+#' a small sample of rows.
+#' @name str
+#' @title Compactly display the structure of a dataset
+#' @rdname str_data_frame
+#' @family dataframe_funcs
+#' @param x a DataFrame
--- End diff --
replace `x` with `object` to match the signature below
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