public C orderSiblingsBy(Expression<?> path) {
        return addFlag(Position.BEFORE_ORDER, ORDER_SIBLINGS_BY, path);
    }
ORDER SIBLINGS BY preserves any ordering specified in the hierarchical query clause and then
applies the order_by_clause to the siblings of the hierarchy.

@param path path
@return the current object
querydsl-sql/src/main/java/com/querydsl/sql/oracle/AbstractOracleQuery.java