Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/21137#discussion_r183671345
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -1255,6 +1255,13 @@ case class ExternalMapToCatalyst private(
override def dataType: MapType = MapType(
keyConverter.dataType, valueConverter.dataType, valueContainsNull =
valueConverter.nullable)
+ private lazy val rowBuffer = InternalRow.fromSeq(Array[Any](1))
--- End diff --
ok
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