Fokko commented on code in PR #2172:
URL: https://github.com/apache/iceberg-python/pull/2172#discussion_r2593957290
##########
pyiceberg/catalog/hive.py:
##########
@@ -719,33 +720,33 @@ def list_tables(self, namespace: str | Identifier) ->
list[Identifier]:
namespace: Database to list.
Returns:
- List[Identifier]: list of table identifiers.
+ Iterator[Identifier]: iterator of table identifiers.
Raises:
NoSuchNamespaceError: If a namespace with the given name does not
exist, or the identifier is invalid.
"""
database_name = self.identifier_to_database(namespace,
NoSuchNamespaceError)
with self._client as open_client:
- return [
+ yield from [
(database_name, table.tableName)
for table in open_client.get_table_objects_by_name(
dbname=database_name,
tbl_names=open_client.get_all_tables(db_name=database_name)
)
if table.parameters.get(TABLE_TYPE, "").lower() == ICEBERG
]
- def list_namespaces(self, namespace: str | Identifier = ()) ->
list[Identifier]:
+ def list_namespaces(self, namespace: str | Identifier = ()) ->
Iterator[Identifier]:
"""List namespaces from the given namespace. If not given, list
top-level namespaces from the catalog.
Returns:
- List[Identifier]: a List of namespace identifiers.
+ Iterator[Identifier]: an iterator of namespace identifiers.
"""
# Hierarchical namespace is not supported. Return an empty list
if namespace:
- return []
+ return iter([])
Review Comment:
I see. The reason I ask is because the `iter` doesn't allow for `len`:
```
Python 3.14.1 (main, Dec 2 2025, 12:51:37) [Clang 17.0.0
(clang-1700.4.4.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> len(iter([1,2,3]))
Traceback (most recent call last):
File "<python-input-0>", line 1, in <module>
len(iter([1,2,3]))
~~~^^^^^^^^^^^^^^^
TypeError: object of type 'list_iterator' has no len()
>>> len([1,2,3])
3
```
##########
pyiceberg/catalog/hive.py:
##########
@@ -719,33 +720,33 @@ def list_tables(self, namespace: str | Identifier) ->
list[Identifier]:
namespace: Database to list.
Returns:
- List[Identifier]: list of table identifiers.
+ Iterator[Identifier]: iterator of table identifiers.
Raises:
NoSuchNamespaceError: If a namespace with the given name does not
exist, or the identifier is invalid.
"""
database_name = self.identifier_to_database(namespace,
NoSuchNamespaceError)
with self._client as open_client:
- return [
+ yield from [
(database_name, table.tableName)
for table in open_client.get_table_objects_by_name(
dbname=database_name,
tbl_names=open_client.get_all_tables(db_name=database_name)
)
if table.parameters.get(TABLE_TYPE, "").lower() == ICEBERG
]
- def list_namespaces(self, namespace: str | Identifier = ()) ->
list[Identifier]:
+ def list_namespaces(self, namespace: str | Identifier = ()) ->
Iterator[Identifier]:
"""List namespaces from the given namespace. If not given, list
top-level namespaces from the catalog.
Returns:
- List[Identifier]: a List of namespace identifiers.
+ Iterator[Identifier]: an iterator of namespace identifiers.
"""
# Hierarchical namespace is not supported. Return an empty list
if namespace:
- return []
+ return iter([])
Review Comment:
I see. The reason I ask is because `iter` doesn't allow for `len`:
```
Python 3.14.1 (main, Dec 2 2025, 12:51:37) [Clang 17.0.0
(clang-1700.4.4.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> len(iter([1,2,3]))
Traceback (most recent call last):
File "<python-input-0>", line 1, in <module>
len(iter([1,2,3]))
~~~^^^^^^^^^^^^^^^
TypeError: object of type 'list_iterator' has no len()
>>> len([1,2,3])
3
```
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