[Bug] Execute showVariablesStmt with where expression return empty resultset

[caiconghui]

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

Version

master

What's Wrong?

MySQL [(none)]> show variables where Variable_name = "wait_timeout";
Empty set (0.01 sec)

What You Expected?

MySQL [(none)]> show variables where Variable_name = "wait_timeout";
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout | 28800 |
+---------------+-------+
1 row in set (0.02 sec)

How to Reproduce?

execute showVariablesStmt with where expression

Anything Else?

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

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