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https://issues.apache.org/jira/browse/ARROW-3870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney reassigned ARROW-3870:
-----------------------------------
Assignee: Wes McKinney
> [C++] Add Peek to InputStream API
> ---------------------------------
>
> Key: ARROW-3870
> URL: https://issues.apache.org/jira/browse/ARROW-3870
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 0.12.0
>
>
> Some InputStream sources support lookahead without advancing the stream, like
> BufferReader and BufferedInputStream. This is used in Parquet's internal IO
> APIs, so it would be useful to be able to remove these after a deprecation
> cycle
> https://github.com/apache/arrow/blob/master/cpp/src/parquet/util/memory.h#L375
> If an InputStream does not support Peek, the returned {{string_view}} would
> have zero size.
> Another option is to have {{Peek}} return {{Status}}, so that NotImplemented
> can be returned. I would prefer to return 0-length if the operation is not
> supported
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