kdbhiggins opened a new pull request, #525:
URL: https://github.com/apache/iceberg-python/pull/525
I discovered an error when trying to deserialize the `CommitTableRequest`
object.
```
request = CommitTableRequest(
requirements=(AssertTableUUID(uuid='4bfd18a3-74c6-478e-98b1-71c4c32f4163'),),
identifier=TableIdentifier(namespace=['a'], name='b'),
)
deserialized_request =
CommitTableRequest.model_validate_json(request.model_dump_json())
```
raises
`TypeError: Can't instantiate abstract class TableRequirement with abstract
method validate`
I added a test to round-trip serialize/deserialize the
`CommitTableRequest`. After investigating I was able to fix it by using
[Discriminated
Unions](https://docs.pydantic.dev/latest/concepts/unions/#discriminated-unions),
which seem like a natural fit for the `TableUpdate` and `TableRequirement`.
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