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https://issues.apache.org/jira/browse/ARROW-7975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-7975.
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Resolution: Fixed
Issue resolved by pull request 6513
[https://github.com/apache/arrow/pull/6513]
> [C++] Do not include padding bytes in "Buffer" IPC metadata accounting
> ----------------------------------------------------------------------
>
> Key: ARROW-7975
> URL: https://issues.apache.org/jira/browse/ARROW-7975
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> At this line, we include the padding bytes into the IPC metadata
> https://github.com/apache/arrow/blob/apache-arrow-0.16.0/cpp/src/arrow/ipc/writer.cc#L192
> The effect of this is that buffer sizes are modified by an IPC roundtrip.
> According to the Format, the padding bytes do not need to be accounted for in
> the metadata.
> https://github.com/apache/arrow/blob/master/format/Schema.fbs#L330
> The Java implementation, for example, does not.
> I ran into this when working on a prototype implementation of ARROW-300,
> where it is important to have the exact unpadded size of the original buffer
> that was written.
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