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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