rdblue commented on code in PR #6525:
URL: https://github.com/apache/iceberg/pull/6525#discussion_r1066401709
##########
python/pyiceberg/avro/resolver.py:
##########
@@ -109,38 +109,46 @@ def resolve(
class SchemaResolver(PrimitiveWithPartnerVisitor[IcebergType, Reader]):
- read_types: Optional[Dict[int, Callable[[Schema], StructProtocol]]]
+ read_types: Dict[int, Type[StructProtocol]]
+ context: List[int]
- def __init__(self, read_types: Optional[Dict[int, Callable[[Schema],
StructProtocol]]]):
+ def __init__(self, read_types: Dict[int, Type[StructProtocol]] =
EMPTY_DICT) -> None:
self.read_types = read_types
+ self.context = []
def schema(self, schema: Schema, expected_schema: Optional[IcebergType],
result: Reader) -> Reader:
return result
+ def before_field(self, field: NestedField, field_partner:
Optional[NestedField]) -> None:
+ self.context.append(field.field_id)
+
+ def after_field(self, field: NestedField, field_partner:
Optional[NestedField]) -> None:
+ self.context.pop()
+
def struct(self, struct: StructType, expected_struct:
Optional[IcebergType], field_readers: List[Reader]) -> Reader:
+ # -1 indicates the struct root
+ read_struct_id = self.context[-1] if len(self.context) > 0 else -1
+ struct_callable = self.read_types.get(read_struct_id, Record)
Review Comment:
It looks like we can use `inspect.getfullargspec(class.__init__)` to inspect
the init arguments. So we could do something like this:
```python
t = self.read_types.get(field_id)
if t:
spec = inspect.getfullargspec(t.__init__)
if len(spec.args) > 1 and 'schema' in spec.args:
create_func = lambda schema: t(**{'schema': read_schema})
else if spec.varkw:
create_func = lambda schema: t(**{'schema': read_schema})
else:
create_func = t
```
That would allow us to keep passing types (which I like) but also pass the
schema if it is supported either by kwargs
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