Wes McKinney created ARROW-301:

             Summary: [Format] Add some form of user field metadata to IPC 
                 Key: ARROW-301
                 URL: https://issues.apache.org/jira/browse/ARROW-301
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Format
            Reporter: Wes McKinney

Users may wish to use user-defined types that can be represented as some Arrow 
primitive type. We should design a mechanism (similar to the key-value metadata 
in Parquet) to make this possible. 

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