[Bug] lost last used database when switch catalog back

[Yulei-Yang]

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• I had searched in the issues and found no similar issues.

Version

master

What's Wrong?

mysql> switch internal;
Query OK, 0 rows affected (0.00 sec)

mysql> use db1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> switch hive;
Query OK, 0 rows affected (0.01 sec)

mysql> switch internal;
Query OK, 0 rows affected (0.00 sec)

mysql> show tables;
ERROR 1046 (3D000): errCode = 2, detailMessage = No database selected

What You Expected?

fix it

How to Reproduce?

No response

Anything Else?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct