feat(mysql)!: support user() for mysql

[AbhishekASLK]

✳️ This PR map exp.CurrentUser to USER for MySQL

select current_user(), user();

+----------------------------+--------------------------------------+
| current_user()             | user()                               |
+----------------------------+--------------------------------------+
| user_44ctrvzeh_44cvj2esn@% | user_44ctrvzeh_44cvj2esn@172.17.0.10 |
+----------------------------+--------------------------------------+

[VaggelisD]

This is not correct despite the common values, USER and CURRENT_USER have different semantics

[AbhishekASLK]

This is not correct despite the common values, USER and CURRENT_USER have different semantics

Thanks for pointing this out.

[georgesittas]

@AbhishekASLK any updates here?

[AbhishekASLK]

@AbhishekASLK any updates here?

Hi @georgesittas

As both have different meaning for MySQL, then we can close this PR.