protected ClickHouseClient getClient() {
        if (client != null) {
            return client;
        }

        ClickHouseNode node = getServer();
        return ClickHouseClient.newInstance(node.getCredentials().orElse(null), node.getProtocol());
    }
Gets client associated with the request.

@return non-null client
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseRequest.java