IF operator alternative in JPQL

JPQL (and dialects as HQL) does not support IF operator/function, but the same functionality could be built with CASE construction:

CASE
    WHEN condition_1 THEN
         ...
    [WHEN condition_n THEN]
         ...
    ELSE
         ... 
END

Example:

SELECT e.name, 

  CASE 

    WHEN (e.salary >= 100000) THEN 1 

    WHEN (e.salary < 100000) THEN 2 

    ELSE 0  

  END 

FROM Employee e;