Github user vofque commented on the issue:
https://github.com/apache/spark/pull/22745
Added these classes:
_UnresolvedGetArrayFromMap_ in unresolved.scala - an unresolved
substitution.
_GetArrayFromMap_ in complexTypeExtractors.scala - an extraction algorithm
(not sure this fits the idea of complexTypeExtractors.scala file)
Tried to follow the example of _UnresolvedExtractValue_ and _ExtractValue_
classes implementation.
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