chore: adjusts type hints to account for complications with mypy part 5

Author: chalmerlowe

packages/bigframes/bigframes/core/local_data.py

@@ -156,7 +156,7 @@ def to_arrow(
             return schema, batches
 
     def is_nullable(self, column_id: identifiers.ColumnId) -> bool:
-        return self.data.column(column_id).null_count > 0
+        return self.data.column(column_id.name).null_count > 0
 
     def to_pyarrow_table(
         self,

packages/bigframes/tests/unit/test_local_engine.py

@@ -171,8 +171,11 @@ def test_polars_local_engine_agg(polars_session):
     pd_result = pd_df.agg(["sum", "count"])
     # local engine appears to produce uint32
     pandas.testing.assert_frame_equal(
-        bf_result, pd_result, check_dtype=False, check_index_type=False
-    )  # type: ignore
+        bf_result,  # type: ignore[arg-type]
+        pd_result,
+        check_dtype=False,
+        check_index_type=False,
+    )
 
 
 def test_polars_local_engine_groupby_sum(polars_session):