asubiotto opened a new issue, #10000:
URL: https://github.com/apache/arrow-rs/issues/10000
**Describe the bug**
`Uuid::deserialize_metadata` rejects any `Some(_)` value, including
`Some("")`. Some Arrow implementations (e.g. arrow-go) unconditionally write
`""` for the `ARROW:extension:metadata` key on every extension-typed field, so
reading such IPC streams with `arrow-rs` fails with `Uuid extension type
expects no metadata`.
**Expected behavior**
An empty metadata string should be treated as equivalent to no metadata,
matching the existing tolerance in `TimestampWithOffset::deserialize_metadata`
(`arrow-schema/src/extension/canonical/timestamp_with_offset.rs:75-88`).
**Additional context**
`Uuid` is the only `Metadata = ()` canonical extension type that doesn't
already accept `Some("")`. `Bool8` and `Json` legitimately use `""` as their
actual metadata value per the canonical spec and should not change.
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