Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15682
Based on my understanding, when we try to drop a view, we [looking up and
analyzing the
view](https://github.com/dongjoon-hyun/spark/blob/fef9981ac140112c05f40c093b2174d1584caaf9/sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala#L203)
and then issue an exception if any involved table has been dropped. We might
have a bug here.
That means, we will not call `uncacheQuery`, if any involved table is
dropped before the view. It is a bug, right?
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