Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19603#discussion_r147589355
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -591,6 +591,9 @@ case class MapObjects private(
case _ => inputData.dataType
}
+ // `MapObjects` generates a while loop to traverse the elements of the
input collection. We
+ // need to take care of Seq and List because they may have O(n)
complexity for indexed accessing
+ // like `list.get(1)`. Here we use Iterator to travers Seq and List.
--- End diff --
nit: travers -> traverse
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