Github user MaxGekk commented on the issue:
https://github.com/apache/spark/pull/21089
@HyukjinKwon I cannot find tests for not-root map types in
JsonFunctionsSuite and JsonExpressionsSuite. I am going to propose a PR for
supporting the map type as root type in from_json. The tests for non-root map
type are not related to the PR and I want to extract them to separate PR.
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