Case statement in where condition is removed by magic parameters

[moufmouf]

For some reason, the case statement is removed from a where condition.

SELECT a FROM users u WHERE status = (CASE WHEN u.id = 1 THEN u.status_1 ELSE u.status_2 END)

=>

SELECT a FROM users u

This is a failing test showcasing the issue.

[coveralls]

Coverage increased (+0.06%) to 68.453% when pulling e1b88d4 on moufmouf:case_in_where into 91dda2c on thecodingmachine:1.3.