syun64 commented on code in PR #305:
URL: https://github.com/apache/iceberg-python/pull/305#discussion_r1469674294
##########
pyiceberg/schema.py:
##########
@@ -1221,50 +1221,57 @@ def assign_fresh_schema_ids(schema_or_type:
Union[Schema, IcebergType], next_id:
class _SetFreshIDs(PreOrderSchemaVisitor[IcebergType]):
"""Traverses the schema and assigns monotonically increasing ids."""
- reserved_ids: Dict[int, int]
+ old_id_to_new_id: Dict[int, int]
def __init__(self, next_id_func: Optional[Callable[[], int]] = None) ->
None:
- self.reserved_ids = {}
+ self.old_id_to_new_id = {}
counter = itertools.count(1)
self.next_id_func = next_id_func if next_id_func is not None else
lambda: next(counter)
- def _get_and_increment(self) -> int:
- return self.next_id_func()
+ def _get_and_increment(self, current_id: int) -> int:
+ new_id = self.next_id_func()
+ self.old_id_to_new_id[current_id] = new_id
+ return new_id
def schema(self, schema: Schema, struct_result: Callable[[], StructType])
-> Schema:
- # First we keep the original identifier_field_ids here, we remap
afterwards
- fields = struct_result().fields
- return Schema(*fields,
identifier_field_ids=[self.reserved_ids[field_id] for field_id in
schema.identifier_field_ids])
+ return Schema(
+ *struct_result().fields,
+ identifier_field_ids=[self.old_id_to_new_id[field_id] for field_id
in schema.identifier_field_ids],
+ )
def struct(self, struct: StructType, field_results: List[Callable[[],
IcebergType]]) -> StructType:
- # assign IDs for this struct's fields first
- self.reserved_ids.update({field.field_id: self._get_and_increment()
for field in struct.fields})
- return StructType(*[field() for field in field_results])
+ new_ids = [self._get_and_increment(field.field_id) for field in
struct.fields]
+ new_fields = []
+ for field_id, field, field_type in zip(new_ids, struct.fields,
field_results):
+ new_fields.append(
+ NestedField(
+ field_id=field_id,
+ name=field.name,
+ field_type=field_type(),
+ required=field.required,
+ doc=field.doc,
+ )
Review Comment:
Yes, I realized that too...
I think the refactored behavior actually [mirrors the Java
code](https://github.com/apache/iceberg/blob/main/api/src/main/java/org/apache/iceberg/types/AssignFreshIds.java#L102)
more closely now in how it takes the Type, and then creates the NestedField
with the result of the field level Callable within the struct function call in
order to assign the IDs first to the fields, and then to its children.
I think preserving this approach allows us to avoid introducing the new
constraint of requiring the field IDs to be unique, and limits that restriction
to just the [correctness in the task of refreshing the
identifier_field_ids](https://github.com/apache/iceberg/blob/main/api/src/main/java/org/apache/iceberg/types/TypeUtil.java#L262),
which requires referring to the field Name by index as well as by name.
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