Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21352#discussion_r202963217
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -360,7 +356,7 @@ case class MapEntries(child: Expression) extends
UnaryExpression with ExpectsInp
override def inputTypes: Seq[AbstractDataType] = Seq(MapType)
- lazy val childDataType: MapType = child.dataType.asInstanceOf[MapType]
+ private def childDataType: MapType = child.dataType.asInstanceOf[MapType]
--- End diff --
this should be a lazy val
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