Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/22455#discussion_r219410274
--- Diff: R/pkg/R/DataFrame.R ---
@@ -226,7 +226,8 @@ setMethod("showDF",
#' show
#'
-#' Print class and type information of a Spark object.
+#' If eager evaluation is enabled and the Spark object is a
SparkDataFrame, return the data of
--- End diff --
return the data of the SparkDataFrame object -> evaluate the SparkDataFrame
and print top rows of the SparkDataFrame
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