Just an idea, would it be possible (and practical) to generate row subclasses
for all schemas, so that you can access the schema in places like this one? E.g.
```
class GeneratedRowSubclassWithSchema$1 extends Row {
public static final Schema ROW_SCHEMA = ...;
}
if (typeDescriptor.isSubtypeOf(TypeDescriptor.of(Row.class)) {
// do reflection magic to extract ROW_SCHEMA static field
}
```
[ Full content available at: https://github.com/apache/beam/pull/6317 ]
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