Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19603#discussion_r147579883
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -591,18 +591,40 @@ case class MapObjects private(
case _ => inputData.dataType
}
- val (getLength, getLoopVar) = inputDataType match {
+ val (getLength, prepareLoop, getLoopVar) = inputDataType match {
case ObjectType(cls) if classOf[Seq[_]].isAssignableFrom(cls) =>
--- End diff --
Also not sure if you want to change this here, but think this is more
direct as `cls.isInstanceOf[Seq[_]]`
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