alamb commented on issue #8828:
URL: https://github.com/apache/arrow-rs/issues/8828#issuecomment-3527420536
> [null_sentinel: 1 byte][type_id: 1 byte][child_row: variable length]
This encoding makes sense to me and I think has sensible semantics
I think it would mean that the union array would be ordered such that the
value with the lowest type id would be ordered before later type id
so fo types like
```
Union (
Int64,
Float
)
```
All `Int64` values would be ordered before the `Float` values
Two `Int64` values would be compared according to normal `Int64` rules
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