Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21155#discussion_r186031064
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -1059,3 +1063,316 @@ case class Flatten(child: Expression) extends
UnaryExpression {
override def prettyName: String = "flatten"
}
+
+@ExpressionDescription(
+ usage = """
--- End diff --
Maybe we need to fix indent in the usage, arguments, examples.
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