Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22162#discussion_r213010879
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -815,6 +815,24 @@ class Dataset[T] private[sql](
println(showString(numRows, truncate, vertical))
// scalastyle:on println
+ /**
+ * Returns the default number of rows to show when the show function is
called without
+ * a user specified max number of rows.
+ * @since 2.3.0
--- End diff --
not needed as this is private, moreover, it'd be since 2.4.0
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