[0.5.0-dev] Spark Row schema skips recursively nested elements

[amarvakul]

Description of Issue

Spark Row schema generated from DefinitionToSparkRow skips recursively nested elements.

E.g.,
In below element structure, the "assigner" field is skipped in the generated spark schema. Refer attachment.

Patient
-> generalPractitioner (Reference Organization|Practitioner)
--> identifier
---> assigner (Reference Organization)

Expected Outcomes

The Spark schema shall be equivalent to the Avro schema.

patient-spark-row-schema.log