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https://issues.apache.org/jira/browse/ARROW-3997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661020#comment-17661020
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Rok Mihevc commented on ARROW-3997:
-----------------------------------
This issue has been migrated to [issue
#20599|https://github.com/apache/arrow/issues/20599] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] [Doc] Clarify dictionary encoding integer signedness (and width?)
> -----------------------------------------------------------------------
>
> Key: ARROW-3997
> URL: https://issues.apache.org/jira/browse/ARROW-3997
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Documentation, Format
> Affects Versions: 0.11.1
> Reporter: Antoine Pitrou
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.12.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> The Arrow spec states that a dictionary-encoded array uses int32 indices.
> Signed or unsigned? The spec doesn't say.
> Also, the C++ implementation supports all kinds of integers as indices (8- to
> 64-bit, signed and unsigned). I wonder if we should at least mandate a
> specific signedness.
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