Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/21857#discussion_r204750587 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala --- @@ -222,6 +222,32 @@ 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 --- End diff -- nit: `a internal` -> `an internal`
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