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  1. Apache Arrow
  2. ARROW-1587

[Format] Add metadata for user-defined logical types

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Won't Fix
    • Affects Version/s: None
    • Fix Version/s: 0.14.0
    • Component/s: Format
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      Description

      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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            • Assignee:
              wesmckinn Wes McKinney
              Reporter:
              wesmckinn Wes McKinney
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