[CALCITE-6729] Ensure TypedValue allows sub-types for local representations

Author: chrisdennis

core/src/main/java/org/apache/calcite/avatica/remote/TypedValue.java

@@ -269,7 +269,7 @@ public Object toLocal() {
    * representation. */
   private static Object serialToLocal(ColumnMetaData.Rep rep, Object value) {
     assert value != null;
-    if (value.getClass() == rep.clazz) {
+    if (rep.clazz.isInstance(value)) {
       return value;
     }
     switch (rep) {

core/src/test/java/org/apache/calcite/avatica/remote/TypedValueTest.java

@@ -44,6 +44,7 @@
 
 import static org.hamcrest.CoreMatchers.instanceOf;
 import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.sameInstance;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
@@ -266,6 +267,15 @@ private void serializeAndEqualityCheck(TypedValue value) {
     Object localObjCopy = tv1Copy.toLocal();
     assertTrue("The local object is an " + localObjCopy.getClass(), localObjCopy instanceof List);
   }
+
+  @Test public void testObjects() {
+    Object o1 = "This is a string";
+    TypedValue tv1 = TypedValue.ofJdbc(Rep.OBJECT, o1, Unsafe.localCalendar());
+    Object jdbcObj = tv1.toJdbc(Unsafe.localCalendar());
+    assertThat(jdbcObj, is(sameInstance(o1)));
+    Object localObj = tv1.toLocal();
+    assertThat(jdbcObj, is(sameInstance(o1)));
+  }
 }
 
 // End TypedValueTest.java