Wes McKinney created ARROW-5428:
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             Summary: [C++] Add option to set "read extent" in 
arrow::io::BufferedInputStream
                 Key: ARROW-5428
                 URL: https://issues.apache.org/jira/browse/ARROW-5428
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.14.0


I'm looking at simplifying libparquet to use common IO interfaces rather than 
its own custom ones

The {{parquet::BufferedInputStream}} interface has an option to not read beyond 
a particular number of bytes. For example, if we were reading a 32MB block with 
1MB buffering, then we will not consume more than 32MB from the raw 
InputStream. 

This seems like a fairly trivial addition to {{arrow::io::BufferedInputStream}} 
to track total read bytes and do not read beyond the configured extent. We'll 
have to add a method like {{set_read_extent}}



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