mb0518 opened a new issue, #38621:
URL: https://github.com/apache/beam/issues/38621
### What happened?
When writing to an Iceberg table via `IcebergIO` on Dataflow, the pipeline
fails with `IllegalArgumentException` during encoding of `FileWriteResult`. The
root cause is:
```
java.lang.RuntimeException: Null value set on non-nullable field
Field{name=keyMetadata, description=, type=BYTES NOT NULL, options={{}}}
```
The `SerializableDataFile` schema at runtime marks **all fields as NOT
NULL**, despite fields 6–13 (`keyMetadata`, `splitOffsets`, `columnSizes`,
`valueCounts`, `nullValueCounts`, `nanValueCounts`, `lowerBounds`,
`upperBounds`) being declared with `@Nullable` in the source code.
The `@Nullable` annotation used is
`org.checkerframework.checker.nullness.qual.Nullable` (a `TYPE_USE`
annotation), which `AutoValueSchema` /
`FieldValueTypeInformation.hasNullableReturnType()` appears to not detect at
runtime.
The error surfaces on `keyMetadata` because it is the first field that is
actually `null` (normal for unencrypted Iceberg tables), but the issue affects
all nullable fields in `SerializableDataFile`.
### Issue Priority
Priority: 1 (data loss / total loss of function)
### Issue Components
- [ ] Component: Python SDK
- [x] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [x] Component: IO connector
- [ ] Component: Beam YAML
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Infrastructure
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Prism Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner
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