mosche commented on pull request #16947:
URL: https://github.com/apache/beam/pull/16947#issuecomment-1057255231
> But the getter methods are public, right?
There's public getters of course, but not following the "getX" naming
convention.
I've also looked briefly at just extending `GetterBasedSchemaProvider`, that
works really well actually. The read part is rather trivial. The field metadata
of each SDK model provides an easy way to read fields (without any reflection
involved).
```java
static class SdkFieldValueGetter<ObjectT, ValueT> implements
FieldValueGetter<ObjectT, ValueT> {
private final SdkField<ValueT> field;
public SdkFieldValueGetter(SdkField<ValueT> field) {
this.field = field;
}
@Override
@Nullable
public ValueT get(ObjectT object) {
return field.getValueOrDefault(object);
}
@Override
public String name() {
return field.memberName();
}
}
```
> Recursive type hierarchies are also definitely support.
Problem with recursive types is the immutable `Schema`. I'm not aware of any
way to generate such a schema for a recursive hierarchy ... same problem exists
for `FieldValueTypeInformation`.
Just verified it quickly, I get a stackoverflow as expected ... so recursive
types are definitely not supported.
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