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https://issues.apache.org/jira/browse/ARROW-491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15927204#comment-15927204
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Julien Le Dem commented on ARROW-491:
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So, from the layout perspective, there's just one vector with fixed width
values of `byteWidth` and a validityVector .
Sounds good to me.
> [C++] Add FixedWidthBinary type
> -------------------------------
>
> Key: ARROW-491
> URL: https://issues.apache.org/jira/browse/ARROW-491
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
>
> This would be very useful for interacting with Parquet and other data sources
> that use fixed-byte-width binary types, as a more efficient version of
> List<UInt8>. We can resolve adding this type to the format spec later.
> [~julienledem] [~nongli] do you have an opinion about this type? Would be
> equivalent to FIXED_LEN_BYTE_ARRAY in Parquet. It would be convenient to
> implement Decimal types on top of this
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