temporay add compile window

Author: chelsea-lin

tests/unit/core/compile/sqlglot/snapshots/test_compile_window/test_compile_window/out.sql

@@ -0,0 +1,32 @@
+SELECT
+`rowindex` AS `rowindex`,
+`int64_col` AS `int64_col`
+FROM
+(SELECT
+  `t1`.`rowindex`,
+  CASE
+    WHEN COALESCE(
+      SUM(CAST((
+        `t1`.`int64_col`
+      ) IS NOT NULL AS INT64)) OVER (
+        ORDER BY `t1`.`rowindex` IS NULL ASC, `t1`.`rowindex` ASC
+        ROWS BETWEEN 2 preceding AND CURRENT ROW
+      ),
+      0
+    ) < 3
+    THEN NULL
+    ELSE COALESCE(
+      SUM(`t1`.`int64_col`) OVER (
+        ORDER BY `t1`.`rowindex` IS NULL ASC, `t1`.`rowindex` ASC
+        ROWS BETWEEN 2 preceding AND CURRENT ROW
+      ),
+      0
+    )
+  END AS `int64_col`
+FROM (
+  SELECT
+    `t0`.`int64_col`,
+    `t0`.`rowindex`
+  FROM `bigframes-dev.sqlglot_test.scalar_types` AS `t0`
+) AS `t1`)
+ORDER BY `rowindex` ASC NULLS LAST

tests/unit/core/compile/sqlglot/test_compile_window.py

@@ -0,0 +1,24 @@
+# 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
+
+import bigframes.pandas as bpd
+
+pytest.importorskip("pytest_snapshot")
+
+
+def test_compile_window(scalar_types_df: bpd.DataFrame, snapshot):
+    result = scalar_types_df[["int64_col"]].sort_index().rolling(window=3).sum()
+    snapshot.assert_match(result.sql, "out.sql")