OPENJPA-2164. If the field being requested is already loaded, then skip the overhead and just return the field value.

git-svn-id: https://svn.apache.org/repos/asf/openjpa/trunk@1307608 13f79535-47bb-0310-9956-ffa450edef68

openjpa-kernel/src/main/java/org/apache/openjpa/kernel/StateManagerImpl.java

@@ -1593,6 +1593,11 @@ public class StateManagerImpl
     public void accessingField(int field) {
         // possibly change state
         try {           
+            // If this field is loaded, and not a PK field allow pass through
+            // TODO -- what about version fields? Could probably UT this
+            if(_loaded.get(field) && !_meta.getField(field).isPrimaryKey())
+                return;
+            
             beforeRead(field);
             beforeAccessField(field);
         } catch (RuntimeException re) {