[jira] [Created] (ARROW-8156) [C++] Add variant of Filesystem::OpenInputFile that has memory-map like behavior if it is possible

["Wes McKinney (Jira)" <ji...@apache.org>]

Wes McKinney created ARROW-8156:
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             Summary: [C++] Add variant of Filesystem::OpenInputFile that has memory-map like behavior if it is possible
                 Key: ARROW-8156
                 URL: https://issues.apache.org/jira/browse/ARROW-8156
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney


TensorFlow has the notion of a ReadOnlyMappedRegion

https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/platform/file_system.h#L106

Rather than toggling memory mapping globally at the LocalFilesystem level, it would be useful for code to be able to request a memory-mapped {[RandomAccessFile}} if memory mapping is possible

See also ARROW-7854



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