public ClickHouseClientBuilder defaultCredentials(ClickHouseCredentials credentials) {
        if (!Objects.equals(this.credentials, credentials)) {
            this.credentials = credentials;
            resetConfig();
        }

        return this;
    }
Sets default credentials, which will be used to connect to a
{@link ClickHouseNode} only when it has no credentials defined.

@param credentials default credentials
@return this builder
clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseClientBuilder.java