public static Object getSecondOperand(FieldPredicate<?> p) {
        return Cast.castOrFail(p, Tuple.class).get(1);
    }
Returns the second operand of the specified {@link FieldPredicate},
throwing an exception if it doesn't exist. The operand may however be
{@code null}.

@param p  the predicate
@return   the operand
runtime-parent/runtime-field/src/main/java/com/speedment/runtime/field/util/PredicateOperandUtil.java