@SuppressWarnings("unchecked")
    private <RT> Union<RT> innerUnion(SubQueryExpression<?>... sq) {
        return innerUnion((List) Arrays.asList(sq));
    }
Add the given Expression as a query flag

@param position position
@param flag query flag
@return the current object
querydsl-sql/src/main/java/com/querydsl/sql/ProjectableSQLQuery.java