rdblue commented on code in PR #13219:
URL: https://github.com/apache/iceberg/pull/13219#discussion_r2229660389
##########
spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/data/SparkPlannedAvroReader.java:
##########
@@ -126,6 +126,11 @@ public ValueReader<?> map(Type partner, Schema map,
ValueReader<?> valueReader)
return SparkValueReaders.map(SparkValueReaders.strings(), valueReader);
}
+ public ValueReader<?> variant(
+ Type partner, ValueReader<?> metadataReader, ValueReader<?>
valueReader) {
+ return ValueReaders.variants();
Review Comment:
This needs to return `VariantVal`. You can add a Spark reader:
```java
private static class VariantReader implements ValueReader<VariantVal> {
private static final VariantReader INSTANCE = new VariantReader();
private final ValueReader<ByteBuffer> metadataReader;
private final ValueReader<ByteBuffer> valueReader;
private VariantReader() {
this.metadataReader = ValueReaders.byteBuffers();
this.valueReader = ValueReaders.byteBuffers();
}
@Override
public VariantVal read(Decoder decoder, Object reuse) throws IOException
{
byte[] metadata = ByteBuffers.toByteArray(metadataReader.read(decoder,
null));
byte[] value = ByteBuffers.toByteArray(valueReader.read(decoder,
null));
return new VariantVal(value, metadata);
}
@Override
public void skip(Decoder decoder) throws IOException {
metadataReader.skip(decoder);
valueReader.skip(decoder);
}
}
```
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