Wes McKinney created ARROW-3782:
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             Summary: [C++] Implement BufferedReader for C++
                 Key: ARROW-3782
                 URL: https://issues.apache.org/jira/browse/ARROW-3782
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.12.0


This will be the reader companion to {{arrow::io::BufferedOutputStream}} and a 
C++-like version of the {{io.BufferedReader}} class in the Python standard 
library

https://docs.python.org/3/library/io.html#io.BufferedReader

We already have a partial version of this that's used in the Parquet library

https://github.com/apache/arrow/blob/master/cpp/src/parquet/util/memory.h#L413

In particular we need

* Seek implemented for random access (it will invalidate the buffer)
* Peek method returning {{shared_ptr<Buffer>}}, a zero copy view into buffered 
memory

This is needed for ARROW-3126



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