Accepts pairs of conditions and values. The function returns the value that belongs to the first condition that evaluates to true. If the number of arguments is odd, the last argument is the default value which is returned when no condition matches.

FROM employees
| EVAL type = CASE(
    languages <= 1, "monolingual",
    languages <= 2, "bilingual",
     "polyglot")
| KEEP first_name, last_name, type