[Rust] Support field metadata #26255
Description
The biggest hurdle to adding field metadata is HashMap and HashSet not implementing Hash, Ord and PartialOrd.
I was thinking of implementing the metadata as a Vec<(String, String)> to overcome this limitation, and then serializing correctly to JSON.
Reporter: Neville Dipale / @nevi-me
Assignee: Qingyou Meng / @mqy
PRs and other links:
Note: This issue was originally created as ARROW-10259. Please see the migration documentation for further details.