Wes McKinney created ARROW-2022:
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Summary: [Format] Add custom metadata field specific to a
RecordBatch message
Key: ARROW-2022
URL: https://issues.apache.org/jira/browse/ARROW-2022
Project: Apache Arrow
Issue Type: Improvement
Components: Format
Reporter: Wes McKinney
While we can have schema- and field-level custom metadata, we cannot send
metadata at the record batch level. This could include things like statistics
(although statistics isn't a great example, because this might be something we
want to eventually standardize), but other things too
See message definitions in
https://github.com/apache/arrow/blob/master/format/Message.fbs
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