Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16541#discussion_r107842061
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -429,24 +430,33 @@ object MapObjects {
* @param function The function applied on the collection elements.
* @param inputData An expression that when evaluated returns a
collection object.
* @param elementType The data type of elements in the collection.
+ * @param collClass The class of the resulting collection
*/
def apply(
function: Expression => Expression,
inputData: Expression,
- elementType: DataType): MapObjects = {
- val loopValue = "MapObjects_loopValue" + curId.getAndIncrement()
- val loopIsNull = "MapObjects_loopIsNull" + curId.getAndIncrement()
+ elementType: DataType,
+ collClass: Class[_] = classOf[Array[_]]): MapObjects = {
--- End diff --
we can make this `collClass` optional.
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