public static ClickHouseLoadBalancingPolicy of(String name) {
        return ClickHouseChecker.isNullOrEmpty(name) ? DEFAULT
                : policies.computeIfAbsent(name.toLowerCase(Locale.ROOT), k -> create(name));
    }
Gets or creates singleton load balancing policy.

@param name policy name, one of {@link #FIRST_ALIVE},{@link #RANDOM} and
            {@link #ROUND_ROBIN}, or a fully qualified class name
@return non-null load balancing policy
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseLoadBalancingPolicy.java