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diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ChildMap.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ChildMap.java
new file mode 100644
index 000000000..8effbb1d5
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ChildMap.java
@@ -0,0 +1,150 @@
+/*******************************************************************************
+ * Copyright (c) 2018 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:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.impl.query;
+
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.serialization.Serializer;
+import org.simantics.db.ObjectResourceIdMap;
+import org.simantics.db.common.WriteBindings;
+import org.simantics.db.common.exception.DebugException;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.impl.graph.ReadGraphImpl;
+import org.simantics.db.impl.procedure.InternalProcedure;
+import org.simantics.db.service.CollectionSupport;
+
+public final class ChildMap extends UnaryQueryP<ObjectResourceIdMap<String>> {
+
+    ChildMap(final int r) {
+        super(r);
+    }
+
+    @Override
+    public final void removeEntry(QueryProcessor provider) {
+        provider.cache.remove(this);
+    }
+
+    @Override
+    public void compute(ReadGraphImpl graph, final InternalProcedure<ObjectResourceIdMap<String>> procedure)
+            throws DatabaseException {
+        computeForEach(graph, id, this, procedure);
+    }
+
+    public static void computeForEach(ReadGraphImpl graph, final int root, final ChildMap entry,
+            final InternalProcedure<ObjectResourceIdMap<String>> procedure_) throws DatabaseException {
+
+        InternalProcedure<ObjectResourceIdMap<String>> procedure = entry != null ? entry : procedure_;
+
+        computeForEach2(graph, root, entry, procedure);
+
+        if (entry != null)
+            entry.performFromCache(graph, procedure_);
+
+    }
+
+    public static void computeForEach2(ReadGraphImpl graph, final int root, final ChildMap parent,
+            final InternalProcedure<ObjectResourceIdMap<String>> procedure) throws DatabaseException {
+
+        if (root == 0) {
+            procedure.execute(graph, null);
+            return;
+        }
+
+        QueryProcessor processor = graph.processor;
+
+        final int consistsOf = processor.getConsistsOf();
+        final int hasName = processor.getHasName();
+
+        ObjectResourceIdMap<String> result = graph.getService(CollectionSupport.class)
+                .createObjectResourceMap(String.class);
+
+        QueryCache.runnerObjects(graph, root, consistsOf, parent, null, new SyncIntProcedure() {
+
+            @Override
+            public void run(ReadGraphImpl graph) throws DatabaseException {
+                procedure.execute(graph, result);
+            }
+
+            @Override
+            public void finished(ReadGraphImpl graph) throws DatabaseException {
+                dec(graph);
+            }
+
+            @Override
+            public void execute(ReadGraphImpl graph, final int obj) throws DatabaseException {
+
+                inc();
+
+                QueryCache.runnerObjects(graph, obj, hasName, parent, null, new IntProcedure() {
+
+                    @Override
+                    public void execute(ReadGraphImpl graph, int i) throws DatabaseException {
+
+                        inc();
+
+                        QueryCache.runnerValueQuery(graph, i, parent, null, new InternalProcedure<byte[]>() {
+
+                            @Override
+                            public void execute(ReadGraphImpl graph, byte[] value) throws DatabaseException {
+
+                                if (value != null) {
+
+                                    try {
+
+                                        Binding b = WriteBindings.STRING;
+                                        Serializer serializer = b.serializer();
+                                        final String part = (String) serializer.deserialize(value);
+                                        result.putId(part, obj);
+
+                                    } catch (Throwable e) {
+                                        if (DebugException.DEBUG)
+                                            new DebugException(e).printStackTrace();
+                                    }
+
+                                }
+
+                                dec(graph);
+
+                            }
+
+                            @Override
+                            public void exception(ReadGraphImpl graph, Throwable t) throws DatabaseException {
+                                dec(graph);
+                            }
+
+                        });
+
+                    }
+
+                    @Override
+                    public void finished(ReadGraphImpl graph) throws DatabaseException {
+                        dec(graph);
+                    }
+
+                    @Override
+                    public void exception(ReadGraphImpl graph, Throwable t) throws DatabaseException {
+                        dec(graph);
+                    }
+
+                });
+
+            }
+
+        });
+
+    }
+
+    @Override
+    public String toString() {
+        return "ChildMap[" + id + "]";
+    }
+
+}