Request login whit username

Hello,
It's possible to use a nick for login in SE.4 ?

anyone can give me some advice?
in my old version 3 I changed the login function. Finally now I want to upgrade to version 4, but users are accustomed to using the nickname OR email

Now i do not know much about the structure SE4

I can't change the query and add "OR username=" ?

for example for version 3 i use:

select * from se_users where user_email={$email} or user_username={$user_username}

t thing there plugin for do that