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diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/DoubleKeyQueryHashMap.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/DoubleKeyQueryHashMap.java
new file mode 100644
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.impl.query;
+
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+
+
+
+/**
+ * An implementation of the Map interface which uses an open addressed
+ * hash table to store its contents.
+ *
+ * Created: Sun Nov  4 08:52:45 2001
+ *
+ * @author Eric D. Friedman
+ * @version $Id: BinaryQueryHashMap.java,v 1.2 2008/03/14 11:38:53 tuoksk Exp $
+ */
+public class DoubleKeyQueryHashMap<Procedure> extends DoubleKeyQueryHash<Procedure> {
+
+    /**
+     * Creates a new <code>THashMap</code> instance with the default
+     * capacity and load factor.
+     */
+    public DoubleKeyQueryHashMap() {
+        super();
+    }
+
+    /**
+     * initialize the value array of the map.
+     *
+     * @param initialCapacity an <code>int</code> value
+     * @return an <code>int</code> value
+     */
+    protected int setUp(int initialCapacity) {
+        int capacity;
+        
+        capacity = super.setUp(initialCapacity);
+//        _values = (Object[]) new Object[capacity];
+        return capacity;
+    }
+    
+    private int sizeInternal = 0;
+    
+    /**
+     * Inserts a key/value pair into the map.
+     *
+     * @param key an <code>Object</code> value
+     * @param value an <code>Object</code> value
+     * @return the previous value associated with <tt>key</tt>,
+     * or null if none was found.
+     */
+    @SuppressWarnings("unchecked")
+	public DoubleKeyValueMap put(final int id, final DoubleKeyValueMap value) {
+    	DoubleKeyValueMap previous = null;
+        Object oldKey;
+        int index = insertionIndex(id);
+        boolean isNewMapping = true;
+        if (index < 0) {
+            index = -index -1;
+            previous = _set[index];
+            isNewMapping = false;
+        }
+        oldKey = _set[index];
+        _set[index] = value;
+        if (isNewMapping) {
+            postInsertHook(oldKey == null);
+        }
+
+        return previous;
+    }
+    
+    public CacheEntry put(final long id, BinaryQuery value) {
+    	int r1 = r1(id);
+    	DoubleKeyValueMap map = get(r1);
+    	if(map == null) {
+    		map = new DoubleKeyValueMap(r1);
+    		put(r1, map);
+    	}
+    	CacheEntry old = map.put(id, value);
+    	if(old == null) sizeInternal++;
+    	return old;
+    }
+
+    /**
+     * rehashes the map to the new capacity.
+     *
+     * @param newCapacity an <code>int</code> value
+     */
+	protected void rehash(int newCapacity) {
+        
+        int oldCapacity = _set.length;
+        DoubleKeyValueMap<Procedure> oldKeys[] = _set;
+
+        DoubleKeyValueMap<Procedure> newKeys[]  = (DoubleKeyValueMap<Procedure>[])Array.newInstance(DoubleKeyValueMap.class, newCapacity);
+
+        for (int i = oldCapacity; i-- > 0;) {
+            if(oldKeys[i] != null && oldKeys[i] != REMOVED) {
+            	DoubleKeyValueMap<Procedure> o = oldKeys[i];
+                int index = insertionIndex2(o.id, newKeys);
+                if (index < 0) {
+                    throwObjectContractViolation(newKeys[(-index -1)], o);
+                }
+                newKeys[index] = o;
+            }
+        }
+        
+        _set = newKeys;
+        
+    }
+
+    /**
+     * retrieves the value for <tt>key</tt>
+     *
+     * @param key an <code>Object</code> value
+     * @return the value of <tt>key</tt> or null if no such mapping exists.
+     */
+    final public DoubleKeyValueMap<Procedure> get(final int id) {
+//        int index = index(id);
+//        return index < 0 ? null : _set[index];
+    	return index2(id);
+    }
+    
+    final protected static long id(long r1, long r2) {
+        long result = (r1<<32) | (r2 & 0xffffffffL); 
+        return result;
+    }
+
+    final public int r1(final long id) {
+        return (int)(id>>>32);
+    }
+    
+    final public int r2(final long id) {
+        return (int)id;
+    }
+    
+    final public BinaryQuery get(final int r1, final int r2) {
+    	DoubleKeyValueMap<Procedure> map = get(r1);
+    	if(map == null) return null;
+    	return map.get(id(r1,r2));
+    }
+
+    final public BinaryQuery get(final long id) {
+    	DoubleKeyValueMap<Procedure> map = get(r1(id));
+    	if(map == null) return null;
+    	return map.get(id);
+    }
+
+    /**
+     * Deletes a key/value pair from the map.
+     *
+     * @param key an <code>Object</code> value
+     * @return an <code>Object</code> value
+     */
+    public Object remove(final int id) {
+        DoubleKeyValueMap<Procedure> prev = null;
+        int index = index(id);
+        if (index >= 0) {
+            prev = _set[index];
+            removeAt(index);    // clear key,state; adjust size
+            sizeInternal-=prev.size();
+        }
+        return prev;
+    }
+
+    public Object remove(final long id) {
+    	int r1 = r1(id);
+    	DoubleKeyValueMap<Procedure> map = get(r1);
+    	if(map == null) return null;
+    	Object removed = map.remove(id);
+    	if(removed != null) sizeInternal--;
+    	if(map.isEmpty()) remove(r1);
+    	return removed;
+    }
+
+    final public void values(int level, CacheCollectionResult result) {
+    	
+        for (int i = _set.length; i-- > 0;) {
+            if(_set[i] != null && _set[i] != REMOVED) {
+            	DoubleKeyValueMap map = _set[i];
+            	map.values(level, result);
+            }
+        }
+    	
+    }
+
+    final public ArrayList<CacheEntry> values() {
+
+    	ArrayList<CacheEntry> result = new ArrayList<CacheEntry>();
+    	
+        for (int i = _set.length; i-- > 0;) {
+            if(_set[i] != null && _set[i] != REMOVED) {
+            	DoubleKeyValueMap map = _set[i];
+            	result.addAll(map.values());
+            }
+        }
+    
+    	return result;
+    	
+    }
+    
+    @Override
+    public int size() {
+        return sizeInternal;
+    }
+    
+    final public static ArrayList<BinaryQuery> NO_VALUES = new ArrayList<BinaryQuery>();
+
+    final public <T extends BinaryQuery> ArrayList<T> values(int r1) {
+
+    	DoubleKeyValueMap map = get(r1);
+    	if(map == null) return (ArrayList<T>)NO_VALUES;
+    	
+    	return map.values();
+    	
+    }
+    
+} // THashMap