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https://issues.apache.org/jira/browse/ARROW-6820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16968370#comment-16968370
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Joris Van den Bossche commented on ARROW-6820:
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To see the description in the (old) docs, this link can be used:
https://github.com/apache/arrow/blob/apache-arrow-0.14.0/docs/source/format/Layout.rst#map-type
The link above of https://arrow.apache.org/docs/format/Layout.html#map-type no
longer works and similar section is not available in
https://arrow.apache.org/docs/format/Columnar.html, I suppose it was removed in
the format docs refactor (ARROW-6820) because it is considered a logical type
and not a physical type?
> [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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