public QuerySettings setReadBufferSize(Integer size) {
        ValidationUtils.checkNotNull(size, "read_buffer_size");
        ValidationUtils.checkRange(size, MINIMAL_READ_BUFFER_SIZE, Integer.MAX_VALUE, "read_buffer_size");
        rawSettings.put("read_buffer_size", size);
        return this;
    }
Read buffer is used for reading data from a server. Size is in bytes.
Minimal value is {@value MINIMAL_READ_BUFFER_SIZE} bytes.
client-v2/src/main/java/com/clickhouse/client/api/query/QuerySettings.java