[Mondrian] Assert not conforming documentation

[Pappyn Bart]

I would like to return SetType(null) in a user defined function.  The
documentation says it is ok to pass null in case the type is not known.
 
But the following code :
 
public class SetType implements Type {
 
    private final Type elementType;
 
    /**
     * Creates a type representing a set of elements of a given type.
     *
     * @param elementType The type of the elements in the set, or null
if not
     *   known
     */
    public SetType(Type elementType) {
        assert elementType instanceof MemberType ||
                elementType instanceof TupleType;
        this.elementType = elementType;
    }
 
-> In case null is passed, then this will raise an assertion failure.
 
Kind regards,
Bart
 
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