mb0518 commented on issue #38621:
URL: https://github.com/apache/beam/issues/38621#issuecomment-4529985239
```java
import org.checkerframework.checker.nullness.qual.Nullable; // TYPE_USE
target
```
## Stack trace
```
java.lang.IllegalArgumentException: Unable to encode element
'FileWriteResult{...keyMetadata=null...}'
with coder 'SchemaCoder<Schema: {...keyMetadata: <BYTES NOT NULL>...}>'
at
org.apache.beam.sdk.coders.Coder.getEncodedElementByteSize(Coder.java:304)
...
at
org.apache.beam.sdk.io.iceberg.WriteGroupedRowsToFiles$WriteGroupedRowsToFilesDoFn.processElement(WriteGroupedRowsToFiles.java:116)
Caused by: java.lang.RuntimeException: Null value set on non-nullable field
Field{name=keyMetadata, description=, type=BYTES NOT NULL, options={{}}}
at
org.apache.beam.sdk.values.RowWithGetters.getValue(RowWithGetters.java:88)
at
org.apache.beam.sdk.coders.RowCoderGenerator$EncodeInstruction.encodeDelegate(RowCoderGenerator.java:435)
...
```
## Related issues
- #33132 — Same class of bug (nullable resolved to NOT NULL) caught in
2.61.0rc1, supposedly fixed but appears to have regressed
- [BEAM-10632](https://issues.apache.org/jira/browse/BEAM-10632) — Original
checkerframework `@Nullable` TYPE_USE detection fix (2.26.0)
- #32795 — Earlier SchemaCoder serialization failure for
`SerializableDataFile`
- -Issue opened: https://github.com/apache/beam/issues/38621
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