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https://issues.apache.org/jira/browse/ARROW-1207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842243#comment-16842243
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Benjamin Kietzman commented on ARROW-1207:
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Are there specific conventions or strong opinions about how this map type
should be represented in a string? I'm leaning toward: {{map<utf8, int32>}} and
{{map<int32, float64, keys_sorted>}} for unsorted/sorted keys respectively.
Alternatively, I could follow dictionary type in verbosity by using
{{map<keys=utf8, values=int32, keys_sorted=false>}} and {{map<keys=int32,
values=float64, keys_sorted=true>}}.
> [C++] Implement Map logical type
> --------------------------------
>
> Key: ARROW-1207
> URL: https://issues.apache.org/jira/browse/ARROW-1207
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Benjamin Kietzman
> Priority: Major
> Fix For: 0.14.0
>
>
> A map is implemented as a list of structs with fields key and value. We
> should separately discuss whether this merits an addition to the Arrow
> metadata
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