OPENJPA-1810: Merge performance changes from trunk.

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.1.x@1044002 13f79535-47bb-0310-9956-ffa450edef68

openjpa-kernel/src/main/java/org/apache/openjpa/datacache/QueryCacheStoreQuery.java

@@ -262,6 +262,10 @@ public class QueryCacheStoreQuery
         return _query.newCompilation();
     }
 
+    public Object getCompilation() {
+        return _query.getCompilation();
+    }
+
     public void populateFromCompilation(Object comp) {
         _query.populateFromCompilation(comp);
     }
@@ -331,7 +335,7 @@ public class QueryCacheStoreQuery
         public ResultObjectProvider executeQuery(StoreQuery q, Object[] params,
             Range range) {
             QueryCacheStoreQuery cq = (QueryCacheStoreQuery) q;
-            Object parsed = cq.getDelegate().newCompilation();
+            Object parsed = cq.getDelegate().getCompilation();
             QueryKey key = QueryKey.newInstance(cq.getContext(),
                 _ex.isPacking(q), params, _candidate, _subs, range.start, 
                 range.end, parsed);

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

@@ -72,6 +72,10 @@ public abstract class AbstractStoreQuery
         return null;
     }
 
+    public Object getCompilation() {
+        return null;
+    }
+
     public void populateFromCompilation(Object comp) {
     }
 

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

@@ -154,6 +154,10 @@ public class ExpressionStoreQuery
         return _parser.parse(ctx.getQueryString(), this);
     }
 
+    public Object getCompilation() {
+        return _parsed;
+    }
+    
     public void populateFromCompilation(Object comp) {
         _parser.populate(comp, this);
     }

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

@@ -90,6 +90,11 @@ public interface StoreQuery
      * Create a new compilation for this query. May be null.
      */
     public Object newCompilation();
+    
+    /**
+     * Get the current compilation for this query. If it is null, do not create. 
+     */
+    public Object getCompilation();
 
     /**
      * Populate internal data from compilation.