Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/21045#discussion_r188876276 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala --- @@ -90,6 +90,132 @@ 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 { + override def inputTypes: Seq[AbstractDataType] = Seq.fill(children.length)(ArrayType) + + def mountSchema(): StructType = { + val arrayAT = children.map(_.dataType.asInstanceOf[ArrayType]) + val fields = arrayAT.zipWithIndex.foldRight(List[StructField]()) { + (item, list) => { + val (arr, idx) = item + StructField(s"_$idx", arr.elementType, arr.containsNull) :: list --- End diff -- `arr.containsNull` -> `arr.nullable || arr.containsNull`
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