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https://issues.apache.org/jira/browse/ARROW-6820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16969024#comment-16969024
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Micah Kornfield commented on ARROW-6820:
----------------------------------------

/// The names of the
/// child fields *may* be respectively "entry", "key", and "value", *but this 
is*
*/// not enforced*

I'm not sure I understand the issue.  The way I read the spec, naming is not 
enforced.  See bolded section.

> [C++] [Doc] [Format] Map specification and implementation inconsistent
> ----------------------------------------------------------------------
>
>                 Key: ARROW-6820
>                 URL: https://issues.apache.org/jira/browse/ARROW-6820
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Documentation, Format
>            Reporter: Antoine Pitrou
>            Priority: Blocker
>             Fix For: 1.0.0
>
>
> In https://arrow.apache.org/docs/format/Layout.html#map-type, the map type is 
> specified as having a child field "pairs", itself with children "keys" and 
> "items".
> In https://github.com/apache/arrow/blob/master/format/Schema.fbs#L60, the map 
> type is specified as having a child field "entry", itself with children "key" 
> and "value".
> In the C++ implementation, a map type has a child field "entries", itself 
> with children "key" and "value".
> In the Java implementation, a map vector also has a child field "entries", 
> itself with children "key" and "value" (by default).



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