Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16233
> Note this is compatible with the views defined by older versions of
Spark(before 2.2), which have empty defaultDatabase and all the relations in
viewText have database part defined.
We need to add a test case for verifying it. See [the example
cases](https://github.com/apache/spark/blob/master/sql/hive/src/test/scala/org/apache/spark/sql/hive/HiveExternalCatalogBackwardCompatibilitySuite.scala#L218-L250).
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