[Feature request] Support `If` statement

[acbin]

Hi, I use the plugin to format the following sql, but it shows Syntax Error: Unexpected "if"

# Write your MySQL query statement below

select employee_id,
if(employee_id %2=1 and left(name, 1) != 'M', salary, 0) bonus
from Employees
order by 1

[nene]

There's a simple reason for this: MySQL is not supported.