Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/21857#discussion_r204679789
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -222,6 +222,37 @@ case class Stack(children: Seq[Expression]) extends
Generator {
}
}
+/**
+ * Replicate the row N times. N is specified as the first argument to the
function.
+ * This is a internal function solely used by optimizer to rewrite EXCEPT
ALL AND
+ * INTERSECT ALL queries.
+ */
+@ExpressionDescription(
--- End diff --
@HyukjinKwon OK..
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