Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21722#discussion_r201180956
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/Metadata.scala ---
@@ -215,6 +215,8 @@ object Metadata {
x.##
case x: Metadata =>
hash(x.map)
+ case null =>
--- End diff --
Basically, we do not support `null` in Metadata.
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