feat(cubesql): SQL push down complex window expressions

Author: MazterQyou

rust/cubesql/cubesql/src/compile/mod.rs

@@ -18588,4 +18588,41 @@ LIMIT {{ limit }}{% endif %}"#.to_string(),
 
         Ok(())
     }
+
+    #[tokio::test]
+    async fn test_double_window_aggr_sql_push_down() {
+        if !Rewriter::sql_push_down_enabled() {
+            return;
+        }
+        init_testing_logger();
+
+        let query_plan = convert_select_to_query_plan(
+            r#"
+            SELECT
+                customer_gender AS customer_gender,
+                notes AS notes,
+                SUM(SUM(taxful_total_price)) OVER (PARTITION BY customer_gender ORDER BY customer_gender) AS sum,
+                AVG(SUM(taxful_total_price)) OVER (PARTITION BY notes ORDER BY notes) AS avg
+            FROM KibanaSampleDataEcommerce
+            GROUP BY 1, 2
+            "#
+            .to_string(),
+            DatabaseProtocol::PostgreSQL,
+        )
+        .await;
+
+        let logical_plan = query_plan.as_logical_plan();
+        let sql = logical_plan
+            .find_cube_scan_wrapper()
+            .wrapped_sql
+            .unwrap()
+            .sql;
+        assert!(sql.contains("OVER (PARTITION BY"));
+
+        let physical_plan = query_plan.as_physical_plan().await.unwrap();
+        println!(
+            "Physical plan: {}",
+            displayable(physical_plan.as_ref()).indent()
+        );
+    }
 }