fix: Fix unordered mode using ordered path to print frame (#839)

Author: TrevorBergeron

bigframes/core/blocks.py

@@ -498,7 +498,7 @@ def to_pandas(
         sampling_method: Optional[str] = None,
         random_state: Optional[int] = None,
         *,
-        ordered: bool = True,
+        ordered: Optional[bool] = None,
     ) -> Tuple[pd.DataFrame, bigquery.QueryJob]:
         """Run query and download results as a pandas DataFrame."""
         if (sampling_method is not None) and (sampling_method not in _SAMPLING_METHODS):
@@ -517,7 +517,10 @@ def to_pandas(
 
         df, query_job = self._materialize_local(
             materialize_options=MaterializationOptions(
-                downsampling=sampling, ordered=ordered
+                downsampling=sampling,
+                ordered=ordered
+                if ordered is not None
+                else self.session._strictly_ordered,
             )
         )
         df.set_axis(self.column_labels, axis=1, copy=False)

tests/system/small/test_unordered.py

@@ -31,6 +31,12 @@ def test_unordered_mode_cache_aggregate(unordered_session):
     assert_pandas_df_equal(bf_result, pd_result, ignore_order=True)
 
 
+def test_unordered_mode_print(unordered_session):
+    pd_df = pd.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}, dtype=pd.Int64Dtype())
+    df = bpd.DataFrame(pd_df, session=unordered_session).cache()
+    print(df)
+
+
 @skip_legacy_pandas
 def test_unordered_mode_read_gbq(unordered_session):
     df = unordered_session.read_gbq(