[I] Incorrect `PartialEq` behavior for `UnionFields` [arrow-rs]

["friendlymatthew (via GitHub)" <gi...@apache.org>]

friendlymatthew opened a new issue, #8936:
URL: https://github.com/apache/arrow-rs/issues/8936

   `UnionFields` represents a set of unique field ids paired with unique data types. Internally, it is stored as a list of `(id, data type)` tuples. However, because `UnionFields` currently derives `PartialEq`, equality is determined by the raw tuple list ordering rather than by set semantics
   
   This leads to incorrect behavior, such as the following assertion failing even though the logical sets are identical:
   
   ```rs
   assert_eq!(
       UnionFields::from(&[(0, t1), (1, t2)]),
       UnionFields::from(&[(1, t2), (0, t1)])
   );
   ```


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