Github user kupferk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21722#discussion_r201219153
--- 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 --
Yes, the `putNull` method exists, but is actually not useable because of
this bug. Having `null` in Metadata would be really helpful for me, as I'd like
to store default values for fields in the Metadata. And NULL is a very common
case as a default value.
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