Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20219
`NullType` is not well supported in almost all the data sources. We did not
mention it in our doc
https://spark.apache.org/docs/latest/sql-programming-guide.html
cc @cloud-fan @marmbrus @rxin @sameeragarwal Any comment about this support?
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