maropu commented on a change in pull request #28983:
URL: https://github.com/apache/spark/pull/28983#discussion_r451215944
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
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@@ -678,6 +678,9 @@ object MapObjects {
elementType: DataType,
elementNullable: Boolean = true,
customCollectionCls: Option[Class[_]] = None): MapObjects = {
+ if (function == null) {
+ throw new UnsupportedOperationException("Cannot instantiate MapObjects
with null function")
+ }
Review comment:
But, this part `(e.g. mistakenly reference an encoder instance when
implementing Aggregator)` will be fixed by this PR, right?
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