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https://issues.apache.org/jira/browse/ARROW-1587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17658620#comment-17658620
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Rok Mihevc commented on ARROW-1587:
-----------------------------------
This issue has been migrated to [issue
#17600|https://github.com/apache/arrow/issues/17600] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Format] Add metadata for user-defined logical types
> ----------------------------------------------------
>
> Key: ARROW-1587
> URL: https://issues.apache.org/jira/browse/ARROW-1587
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 0.14.0
>
>
> While we have the custom_metadata field at the Field level, it may be useful
> to have a proper user-defined type metadata in the `Type` union, which would
> allow us to provide a physical representation type (e.g. "Latitude longitude
> is represented by a struct, whose children consist of two doubles") from the
> other non-user defined types.
> This is more flexible than {{custom_metadata}} because we can leverage
> existing structure in the Flatbuffers for describing the user type
> https://github.com/apache/arrow/blob/master/format/Schema.fbs#L285
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