Fix GROUP BY over EXTRACT test to not constant-fold

This also fixes a query failure during the new year period caused by
the time zone in TestingSession (used by Presto) being different from
the JVM time zone (used by H2).

presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestAggregations.java

@@ -638,14 +638,14 @@ public void testGroupByNullIf()
     public void testGroupByExtract()
     {
         // whole expression in group by
-        assertQuery("SELECT EXTRACT(YEAR FROM now()), count(*) FROM orders GROUP BY EXTRACT(YEAR FROM now())");
+        assertQuery("SELECT EXTRACT(YEAR FROM orderdate), count(*) FROM orders GROUP BY EXTRACT(YEAR FROM orderdate)");
 
         assertQuery(
-                "SELECT EXTRACT(YEAR FROM now()), count(*) FROM orders GROUP BY 1",
-                "SELECT EXTRACT(YEAR FROM now()), count(*) FROM orders GROUP BY EXTRACT(YEAR FROM now())");
+                "SELECT EXTRACT(YEAR FROM orderdate), count(*) FROM orders GROUP BY 1",
+                "SELECT EXTRACT(YEAR FROM orderdate), count(*) FROM orders GROUP BY EXTRACT(YEAR FROM orderdate)");
 
         // argument in group by
-        assertQuery("SELECT EXTRACT(YEAR FROM now()), count(*) FROM orders GROUP BY now()");
+        assertQuery("SELECT EXTRACT(YEAR FROM orderdate), count(*) FROM orders GROUP BY orderdate");
     }
 
     @Test