test: Add smoke tests for grouped joins

Author: mcheshkov

packages/cubejs-testing/test/__snapshots__/smoke-cubesql.test.ts.snap

@@ -57,6 +57,32 @@ Array [
 ]
 `;
 
+exports[`SQL API Postgres (Data) join with filtered grouped query: join grouped with filter 1`] = `
+Array [
+  Object {
+    "count": "2",
+    "status": "processed",
+  },
+  Object {
+    "count": "2",
+    "status": "new",
+  },
+]
+`;
+
+exports[`SQL API Postgres (Data) join with grouped query: join grouped 1`] = `
+Array [
+  Object {
+    "count": "2",
+    "status": "processed",
+  },
+  Object {
+    "count": "1",
+    "status": "shipped",
+  },
+]
+`;
+
 exports[`SQL API Postgres (Data) metabase max number: metabase max number 1`] = `
 Array [
   Object {

packages/cubejs-testing/test/smoke-cubesql.test.ts

@@ -404,6 +404,64 @@ describe('SQL API', () => {
       expect(res.rows).toEqual([{ max: null }]);
     });
 
+    test('join with grouped query', async () => {
+      const query = `
+        SELECT
+          "Orders".status AS status,
+          COUNT(*) AS count
+        FROM
+          "Orders"
+          INNER JOIN
+          (
+            SELECT
+              status,
+              SUM(totalAmount)
+            FROM
+              "Orders"
+            GROUP BY 1
+            ORDER BY 2 DESC
+            LIMIT 2
+          ) top_orders
+        ON
+          "Orders".status = top_orders.status
+        GROUP BY 1
+        `;
+
+      const res = await connection.query(query);
+      // Expect only top statuses 2 by total amount: processed and shipped
+      expect(res.rows).toMatchSnapshot('join grouped');
+    });
+
+    test('join with filtered grouped query', async () => {
+      const query = `
+        SELECT
+          "Orders".status AS status,
+          COUNT(*) AS count
+        FROM
+          "Orders"
+          INNER JOIN
+          (
+            SELECT
+              status,
+              SUM(totalAmount)
+            FROM
+              "Orders"
+            WHERE
+              status NOT IN ('shipped')
+            GROUP BY 1
+            ORDER BY 2 DESC
+            LIMIT 2
+          ) top_orders
+        ON
+          "Orders".status = top_orders.status
+        GROUP BY 1
+        `;
+
+      const res = await connection.query(query);
+      // Expect only top statuses 2 by total amount, with shipped filtered out: processed and new
+      expect(res.rows).toMatchSnapshot('join grouped with filter');
+    });
+
     test('where segment is false', async () => {
       const query =
         'SELECT value AS val, * FROM "SegmentTest" WHERE segment_eq_1 IS FALSE ORDER BY value;';