Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/3944#issuecomment-69366669
@rxin CaseInsensitiveMap is used to pass options to [a user defined
relation
resolver](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala#L44)
for creating a relation. If this map is passed into the created relation, we
will try to serialize it with the closure.
@marmbrus and I talked about it offline yesterday. Maybe it is a good idea
to just make it serializable. So, developers will not need to worry about this
issue at all.
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