Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16161
> there is no type that is assignable to both mutable.Map and immutable.Map
Yea, and a general solution would be, remember the original type and create
that type when converting catalyst value to external value.
But this may be hard to implement, it may worth to merge this simple PR, as
the `scala.collection.immutable.Map` is so common in scala. cc @rxin @yhuai
@liancheng
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