Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r188187779
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -90,6 +90,110 @@ case class MapKeys(child: Expression)
override def prettyName: String = "map_keys"
}
+@ExpressionDescription(
+ usage = """_FUNC_(a1, a2) - Returns a merged array matching N-th element
of first
+ array with the N-th element of second.""",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), array(2, 3, 4));
+ [[1, 2], [2, 3], [3, 4]]
+ """,
+ since = "2.4.0")
+case class Zip(left: Expression, right: Expression)
--- End diff --
Inherit your class directly from `Expression`. You can get inspired by
`CreateArray` or `Concat` expression.
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