static int getDefaultReadBufferSize() {
        return getBufferSize(DEFAULT_READ_BUFFER_SIZE, DEFAULT_BUFFER_SIZE, DEFAULT_MAX_BUFFER_SIZE);
    }
Gets default read buffer size in byte. Same as
{@code getBufferSize(DEFAULT_READ_BUFFER_SIZE, DEFAULT_BUFFER_SIZE, DEFAULT_MAX_BUFFER_SIZE)}.

@return default read buffer size in byte
clickhouse-data/src/main/java/com/clickhouse/data/ClickHouseDataConfig.java