Wes McKinney updated ARROW-1587:
    Fix Version/s:     (was: 0.10.0)

> [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
>            Priority: Major
>             Fix For: 0.11.0
> 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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