Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/21857#discussion_r204677899 --- 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 -- If it's for an internal purpose, you can just remove this though.
--- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org