homar opened a new issue #3704:
URL: https://github.com/apache/iceberg/issues/3704
Simplest way to reproduce:
```BaseTable table = ;//...
table.updateSchema().addColumn("_fixed",
Types.FixedType.ofLength(6)).commit();
TableMetadata currentMetadata = table.operations().current();
PartitionSpec partitionSpec =
PartitionSpec.builderFor(table.schema()).identity("_fixed").build();
TableMetadata newMetadata =
table.operations().current().updatePartitionSpec(partitionSpec);
table.operations().commit(currentMetadata, newMetadata);
DataFile data = DataFiles.builder(table.spec())
.withPath("ignoredWithoutReading")
.withFileSizeInBytes(410)
.withFormat("ORC")
.withMetrics(new Metrics(0L, null, ImmutableMap.of(),
ImmutableMap.of()))
.withPartition(PartitionData.fromJson("{\"partitionValues\":[\"/wD/7v/u\"]}",
new Type[]{Types.FixedType.ofLength(6)}))
.build();
table.newAppend().appendFile(data).commit()
// Caused by: java.lang.ClassCastException: class java.nio.HeapByteBuffer
cannot be cast to class org.apache.avro.generic.GenericData$Fixed
(java.nio.HeapByteBuffer is in module java.base of loader 'bootstrap';
org.apache.avro.generic.GenericData$Fixed is in unnamed module of loader 'app')
`
The problem is that value of Fixed column is first wrapped in ByteBuffer and
then ValueWriters try to cast it to GenericData.Fixed .
Wrapping is done based on the javaClass that comes from PartitionSpec and in
my case PartitionSpec is generated by the BaseTable . Basically it comes from
https://github.com/apache/iceberg/blob/202628df7f914bd184ba49226256cc1edea0e18e/api/src/main/java/org/apache/iceberg/types/Type.java#L40
It works fine with `binary` column.
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