Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/22162#discussion_r213157406
--- 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
+ */
+ private def numberOfRowsToShow(): Int = {
+ this.sparkSession.conf.get("spark.sql.show.defaultNumRows", "20").toInt
--- End diff --
+1
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