feat: Add row numbering local pushdown in hybrid execution (#1932)

Author: TrevorBergeron

bigframes/session/polars_executor.py

@@ -40,6 +40,7 @@
     nodes.ConcatNode,
     nodes.JoinNode,
     nodes.InNode,
+    nodes.PromoteOffsetsNode,
 )
 
 _COMPATIBLE_SCALAR_OPS = (

tests/system/small/engines/test_windowing.py

@@ -0,0 +1,33 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+from bigframes.core import array_value
+from bigframes.session import polars_executor
+from bigframes.testing.engine_utils import assert_equivalence_execution
+
+pytest.importorskip("polars")
+
+# Polars used as reference as its fast and local. Generally though, prefer gbq engine where they disagree.
+REFERENCE_ENGINE = polars_executor.PolarsExecutor()
+
+
+@pytest.mark.parametrize("engine", ["polars", "bq", "bq-sqlglot"], indirect=True)
+def test_engines_with_offsets(
+    scalars_array_value: array_value.ArrayValue,
+    engine,
+):
+    result, _ = scalars_array_value.promote_offsets()
+    assert_equivalence_execution(result.node, REFERENCE_ENGINE, engine)