add test for setting time zone from table value

Author: angelamayxie

enginetest/queries/time_queries.go

@@ -59,4 +59,25 @@ var TimeQueryTests = []ScriptTest{
 			},
 		},
 	},
+	{
+		Name: "set time zone from table value",
+		SetUpScript: []string{
+			"create table timezones(pk int primary key, tz varchar(20))",
+			"insert into timezones values (1, 'invalid time zone'), (2, '-5:00')",
+		},
+		Assertions: []ScriptTestAssertion{
+			{
+				Query:       "set time_zone=(select tz from timezones where pk = 1)",
+				ExpectedErr: sql.ErrInvalidTimeZone,
+			},
+			{
+				Query:    "set time_zone=(select tz from timezones where pk = 2)",
+				Expected: []sql.Row{{types.NewOkResult(0)}},
+			},
+			{
+				Query:    "select now()",
+				Expected: []sql.Row{{time.Date(2025, time.July, 23, 11, 43, 21, 0, time.UTC)}},
+			},
+		},
+	},
 }