Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16233
Could you also add a test case for verifying the error behaviors?
For example, in the definition of a nested view, how Analyzer behaves when
the dependent databases, views, or views are dropped.
```
|- view1 (defaultDatabase = db1)
|- operator
|- table2 (defaultDatabase = db1)
|- view2 (defaultDatabase = db2)
|- view3 (defaultDatabase = db3)
|- table3 (defaultDatabase = db5)
|- view4 (defaultDatabase = db4)
```
In the following cases, what kind of errors we got when resolving `view1`
- What happened when `db2` is dropped?
- What happened when `view2` is dropped?
- What happened when `view3` is dropped?
- What happened when `table3` is dropped?
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