Github user DylanGuedes commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r188693270
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -90,6 +90,117 @@ 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"_$idx", arr.elementType, arr.containsNull) :: list
+ }
+ }
+ StructType(fields)
+ }
+
+ override def dataType: DataType = ArrayType(mountSchema())
+
+ override def prettyName: String = "zip"
+
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ val genericArrayData = classOf[GenericArrayData].getName
+ val genericInternalRow = classOf[GenericInternalRow].getName
+
+ val evals = children.map(_.genCode(ctx))
+ val numArrs = evals.length
+
+ val arrCardinality = ctx.freshName("args")
+ val arrVals = ctx.freshName("arrVals")
+ val inputs = evals.zipWithIndex.map { case (eval, index) =>
+ s"""
+ |${eval.code}
+ |if (!${eval.isNull}) {
+ | $arrVals[$index] = ${eval.value};
+ |}
+ """.stripMargin
+ }.mkString("\n")
+
+ val myobject = ctx.freshName("myobject")
+ val biggestCardinality = ctx.freshName("biggestCardinality")
+ val j = ctx.freshName("j")
+ val i = ctx.freshName("i")
+ val args = ctx.freshName("args")
+
+ ev.copy(s"""
+ |ArrayData[] $arrVals = new ArrayData[$numArrs];
+ |int[] $arrCardinality = new int[$numArrs];
+ |$inputs
+ |int $biggestCardinality = 0;
+ |for (int $i = 0; $i < $numArrs; $i ++) {
+ | $arrCardinality[$i] = $arrVals[$i].numElements();
+ | $biggestCardinality = Math.max($biggestCardinality,
$arrCardinality[$i]);
+ |}
+ |Object[] $args = new Object[$biggestCardinality];
+ |for (int $i = 0; $i < $biggestCardinality; $i ++) {
+ | Object[] $myobject = new Object[$numArrs];
+ | for (int $j = 0; $j < $numArrs; $j ++) {
+ | if ($arrCardinality[$j] > $i) {
+ | $myobject[$j] = $arrVals[$j].getInt(0);
+ | } else {
+ | $myobject[$j] = null;
+ | }
+ | }
+ | $args[$i] = new $genericInternalRow($myobject);
+ |}
+ |$genericArrayData ${ev.value} = new $genericArrayData($args);
+ """.stripMargin)
+ }
+
+ override def nullable: Boolean = children.forall(_.nullable)
+
+ override def eval(input: InternalRow): Any = {
+ val inputArrays = children.map(_.eval(input).asInstanceOf[ArrayData])
+ val arrayTypes =
children.map(_.dataType.asInstanceOf[ArrayType].elementType)
+ val numberOfArrays = children.length
+
+ var biggestCardinality = 0
+ for (e <- inputArrays) {
+ biggestCardinality = biggestCardinality max e.numElements()
--- End diff --
Great to know, fixed.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
