[ARROW-6820] [C++] [Doc] [Format] Map specification and implementation inconsistent

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: C++, Documentation, Format
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/23152
• Assignee: Bryan Cutler
• Reporter: Antoine Pitrou
• Created: 08/Oct/19 17:39
• Updated: 11/Jan/23 07:49
• Resolved: 15/Nov/19 05:53

Description

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).

Issue Links

• relates to: ARROW-6904 [Python] Implement MapArray and MapType
• links to: GitHub Pull Request #5821