Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/21045#discussion_r192849961 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala --- @@ -128,6 +128,175 @@ 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) + + override def dataType: DataType = ArrayType(mountSchema) + + override def nullable: Boolean = children.forall(_.nullable) + + private lazy val arrayTypes = children.map(_.dataType.asInstanceOf[ArrayType]) + + private lazy val arrayElementTypes = arrayTypes.map(_.elementType) + + def mountSchema: StructType = { + val fields = children.zip(arrayElementTypes).zipWithIndex.map { + case ((expr: NamedExpression, elementType), _) => + StructField(expr.name, elementType, nullable = true) + case ((_, elementType), idx) => + StructField(s"$idx", elementType, nullable = true) + } + StructType(fields) + } + + val numberOfArrays: Int = children.length + + def emptyInputGenCode(ev: ExprCode): ExprCode = { + val genericArrayData = classOf[GenericArrayData].getName + + ev.copy(code""" + |${CodeGenerator.javaType(dataType)} ${ev.value} = new $genericArrayData(new Object[0]); + |${ev.isNull} = true; --- End diff -- `false`?
--- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org