Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r188287355
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -90,6 +90,88 @@ case class MapKeys(child: Expression)
override def prettyName: String = "map_keys"
}
+@ExpressionDescription(
+ usage = """_FUNC_(a1, a2, ...) - Returns a merged array containing in
the N-th position the
+ N-th value of each array given.""",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), array(2, 3, 4));
+ [[1, 2], [2, 3], [3, 4]]
+ > SELECT _FUNC_(array(1, 2), array(2, 3), array(3, 4));
+ [[1, 2, 3], [2, 3, 4]]
+ """,
+ since = "2.4.0")
+case class Zip(children: Seq[Expression]) extends Expression with
ExpectsInputTypes {
+ private[this] val childrenArray = children.toArray
+
+ override def inputTypes: Seq[AbstractDataType] =
Seq.fill(childrenArray.length)(ArrayType)
+
+ def mountSchema(): StructType = {
--- End diff --
I think the whole method may be done more easily using foldLeft/foldRight
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