Fix Union type with dataclass ambiguous error and support superset comparison #5529

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5 errors

avoid direct access to proto field sourceMetaData.Fields, use sourceMetaData.GetFields() instead (protogetter)

avoid direct access to proto field targetMetaData.Fields, use targetMetaData.GetFields() instead (protogetter)

avoid direct access to proto field sourceMetaData.Fields, use sourceMetaData.GetFields() instead (protogetter)

avoid direct access to proto field targetMetaData.Fields, use targetMetaData.GetFields() instead (protogetter)

Process completed with exit code 2.