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Posted to github@beam.apache.org by "mananmangal (via GitHub)" <gi...@apache.org> on 2026/09/27 17:57:40 UTC
[I] [Bug]: IcebergIO cannot write Beam rows containing EnumerationType (proto enum) fields [beam]
mananmangal opened a new issue, #40299:
URL: https://github.com/apache/beam/issues/40299
### What happened?
Writing a `Row` with an `EnumerationType` logical type field (e.g. from `ProtoSchemaTranslator` on a proto message with an `enum` field) to `IcebergIO.writeRows()` fails. `EnumerationType` isn't one of the cases [handled here](https://github.com/apache/beam/blob/020707df9d6d0276a936d98e4f79f4792e761005/sdks/java/io/iceberg/src/main/java/org/apache/beam/sdk/io/iceberg/IcebergUtils.java#L236), so schema derivation throws immediately:
```
java.lang.RuntimeException: Unsupported Beam logical type Enum
at org.apache.beam.sdk.io.iceberg.IcebergUtils.beamFieldTypeToIcebergFieldType(IcebergUtils.java:236)
at org.apache.beam.sdk.io.iceberg.IcebergUtils.beamSchemaToIcebergSchema(IcebergUtils.java:323)
```
Pre-creating the table doesn't help either. `copyFieldIntoRecord` calls `Row.getString()`/`Row.getInt32()` [directly](https://github.com/apache/beam/blob/020707df9d6d0276a936d98e4f79f4792e761005/sdks/java/io/iceberg/src/main/java/org/apache/beam/sdk/io/iceberg/IcebergUtils.java#L392), so it fails trying to cast the field's `EnumerationType.Value` to `String`:
```
java.lang.ClassCastException: class org.apache.beam.sdk.schemas.logicaltypes.EnumerationType$Value cannot be cast to class java.lang.String
at org.apache.beam.sdk.io.iceberg.IcebergUtils.copyFieldIntoRecord(IcebergUtils.java:392)
```
Avro (`AvroUtils.genericFromBeamField`) and BigQuery (`BigQueryUtils.fromBeamField`) already convert `EnumerationType` to a string on write, so there's a working pattern to follow here.
### Issue Priority
Priority: 2 (default / most bugs should be filed as P2)
### 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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Re: [I] [Bug]: IcebergIO cannot write Beam rows containing EnumerationType (proto enum) fields [beam]
Posted by "ahmedabu98 (via GitHub)" <gi...@apache.org>.
ahmedabu98 closed issue #40299: [Bug]: IcebergIO cannot write Beam rows containing EnumerationType (proto enum) fields
URL: https://github.com/apache/beam/issues/40299
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Re: [I] [Bug]: IcebergIO cannot write Beam rows containing EnumerationType (proto enum) fields [beam]
Posted by "mananmangal (via GitHub)" <gi...@apache.org>.
mananmangal commented on issue #40299:
URL: https://github.com/apache/beam/issues/40299#issuecomment-5858368457
.take-issue
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