[C++]How to use BufferedInputStream in parquet::arrow::OpenFile()?

[annsshadow]

Hi~all

I try to use BufferedInputStream to reduce the overhead of some small read from 
the network.

The pseudo codes are below:




```

//get the buffered input stream

auto buffered_result = arrow::io::BufferedInputStream::Create()

_buffered_infile = buffered_result.ValueOrDie();




// follow the example codes, I want to open a parquet file like that

// but it meets compiler error: could not convert from 
'std::shared_ptr<arrow::io::BufferedInputStream>' to 
'std::shared_ptr<arrow::io::RandomAccessFile>'

PARQUET_THROW_NOT_OK(parquet::arrow::OpenFile(_buffered_infile,arrow::default_memory_pool(),
 &_reader_parquet));




//the declaration of OpenFile

//Status OpenFile(std::shared_ptr<::arrow::io::RandomAccessFile> file, 
MemoryPool* pool,

                std::unique_ptr<FileReader>* reader)

```




How can I use it correctly?

Thanks all~