add more tests

Author: angelamayxie

enginetest/queries/order_by_group_by_queries.go

@@ -362,4 +362,43 @@ var OrderByGroupByScriptTests = []ScriptTest{
 			},
 		},
 	},
+	{
+		Name: "valid group by order by queries",
+		SetUpScript: []string{
+			"create table t0(c0 int primary key, c1 int, c2 int, c3 int)",
+			"insert into t0 values (3, 1, 3, 1), (4, 1, 7, 2), (5, 2, 9, 3),(6,2, 1, 3), (7,2, 2, 2),(8,3,2, 5)",
+		},
+		Assertions: []ScriptTestAssertion{
+			{
+				// group by primary key
+				Query:    "select c1 from t0 group by c0 order by c2",
+				Expected: []sql.Row{{2}, {2}, {3}, {1}, {1}, {2}},
+			},
+			{
+				// order by aggregate
+				Query:    "select c1 from t0 group by c1 order by min(c2)",
+				Expected: []sql.Row{{2}, {3}, {1}},
+			},
+			{
+				// order by alias for column in group by clause
+				Query:    "select c1 as col from t0 group by c1 order by col",
+				Expected: []sql.Row{{1}, {2}, {3}},
+			},
+			{
+				// order by alias for aggregate column
+				Query:    "select min(c0) as min, c1 from t0 group by c1 order by min",
+				Expected: []sql.Row{{3, 1}, {5, 2}, {8, 3}},
+			},
+			{
+				// order by multiple columns
+				Query:    "select c1 from t0 group by c1, c2, c3 order by c2, c3",
+				Expected: []sql.Row{{2}, {2}, {3}, {1}, {1}, {2}},
+			},
+			{
+				// order by functionally dependent column
+				Query:    "select c1 from t0 where c2 = 3 group by c1 order by c2",
+				Expected: []sql.Row{{1}},
+			},
+		},
+	},
 }