feat(cubesql): Support Null input type in SUM and AVG functions

Author: MazterQyou

packages/cubejs-backend-native/Cargo.lock

@@ -10,7 +10,7 @@ homepage = "https://cube.dev"
 
 [dependencies]
 arc-swap = "1"
-datafusion = { git = 'https://github.com/cube-js/arrow-datafusion.git', rev = "370f91fda4a7e9387dded4edaf2425c447e76fbd", default-features = false, features = ["regex_expressions", "unicode_expressions"] }
+datafusion = { git = 'https://github.com/cube-js/arrow-datafusion.git', rev = "8d98b8587052b35888d29d70ba94618bd913ad39", default-features = false, features = ["regex_expressions", "unicode_expressions"] }
 anyhow = "1.0"
 thiserror = "1.0.50"
 cubeclient = { path = "../cubeclient" }

rust/cubesql/Cargo.lock

@@ -24300,4 +24300,29 @@ LIMIT {{ limit }}{% endif %}"#.to_string(),
             }
         )
     }
+
+    #[tokio::test]
+    async fn test_sum_avg_null_type() -> Result<(), CubeError> {
+        init_logger();
+
+        insta::assert_snapshot!(
+            "sum_null_type",
+            execute_query(
+                "SELECT SUM(x) FROM (SELECT NULL AS x) AS t".to_string(),
+                DatabaseProtocol::PostgreSQL
+            )
+            .await?
+        );
+
+        insta::assert_snapshot!(
+            "avg_null_type",
+            execute_query(
+                "SELECT AVG(x) FROM (SELECT NULL AS x) AS t".to_string(),
+                DatabaseProtocol::PostgreSQL
+            )
+            .await?
+        );
+
+        Ok(())
+    }
 }

rust/cubesql/cubesql/Cargo.toml

@@ -0,0 +1,9 @@
+---
+source: cubesql/src/compile/mod.rs
+expression: "execute_query(\"SELECT AVG(x) FROM (SELECT NULL AS x) AS t\".to_string(),\nDatabaseProtocol::PostgreSQL).await?"
+---
++----------+
+| AVG(t.x) |
++----------+
+| NULL     |
++----------+

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

@@ -0,0 +1,9 @@
+---
+source: cubesql/src/compile/mod.rs
+expression: "execute_query(\"SELECT SUM(x) FROM (SELECT NULL AS x) AS t\".to_string(),\nDatabaseProtocol::PostgreSQL).await?"
+---
++----------+
+| SUM(t.x) |
++----------+
+| NULL     |
++----------+