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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2017/09/21 00:00:00 UTC

[jira] [Created] (ARROW-1587) [Format] Add metadata for user-defined logical types

Wes McKinney created ARROW-1587:
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             Summary: [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
             Fix For: 0.8.0


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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