How do I build an expression for a multi-element in-list?

How do I build an expression for a multi-element in-list? For example:
SELECT * FROM employees
WHERE (first_name, last_name, email) IN
(('Guy', 'Himuro', 'GHIMURO'),('Karen', 'Colmenares', 'KCOLMENA'))
Passing a Vector to Expression.in(Vector) where each element is a Vector of values itself will result in the appropriate expression for the values clause, but how to I get the columns to be considered together, that is, how do I get the "(first_name, last_name, email)" part?
Steve

Steve,
I do not believe this is currently supported in the TopLink expression framework. Your best bet at this point will be to use custom SQL.
Doug

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