Github user aray commented on the issue:
https://github.com/apache/spark/pull/16161
The approach is to change the deserializer (via
`ScalaReflection#deserializerFor`) to return the more specific type
`scala.collections.immutable.Map` instead of `scala.collections.Map` as it does
now (no change to `ArrayBasedMapData#toScalaMap` is needed as it already
returns an immutable map). This allows the generated code for case classes
using either of those Map's to work as they are both assignable from
`scala.collections.immutable.Map`. This PR does not address
`scala.collections.mutable.Map`, it still wont work.
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