Improve Dart master index selectivity.

pkg/analysis_services/lib/src/index/store/split_store.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library services.src.index.store.split_store;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:io';
 import 'dart:typed_data';
@@ skipping 622 matching lines @@
   }
 
   Future<List<Location>> getRelationships(Element element,
       Relationship relationship) {
     // special support for UniverseElement
     if (identical(element, UniverseElement.INSTANCE)) {
       List<Location> locations = _getRelationshipsUniverse(relationship);
       return new Future.value(locations);
     }
     // prepare node names
-    String name = _getElementName(element);
-    int nameId = _stringCodec.encode(name);
+    int nameId = _elementCodec.encodeHash(element);
     List<int> nodeNameIds = _nameToNodeNames.get(nameId);
     // prepare Future(s) for reading each IndexNode
     List<Future<List<Location>>> nodeFutures = <Future<List<Location>>>[];
     for (int nodeNameId in nodeNameIds) {
       String nodeName = _stringCodec.decode(nodeNameId);
       Future<IndexNode> nodeFuture = _nodeManager.getNode(nodeName);
       Future<List<Location>> locationsFuture = nodeFuture.then((node) {
         if (node == null) {
           // TODO(scheglov) remove node
           return Location.EMPTY_ARRAY;
@@ skipping 136 matching lines @@
     }
     Set<Source> units = libraryToUnits[library];
     if (units == null) {
       units = new HashSet<Source>();
       libraryToUnits[library] = units;
     }
     units.add(unit);
   }
 
   void _recordNodeNameForElement(Element element) {
-    String name = _getElementName(element);
-    int nameId = _stringCodec.encode(name);
+    int nameId = _elementCodec.encodeHash(element);
     _nameToNodeNames.add(nameId, _currentNodeNameId);
   }
 
   void _recordRelationshipUniverse(Relationship relationship,
       Location location) {
     // in current context
     Map<int, Map<Relationship, List<LocationData>>> nodeRelations =
         _contextNodeRelations[_currentContextId];
     if (nodeRelations == null) {
       nodeRelations = new HashMap<int, Map<Relationship, List<LocationData>>>();
@@ skipping 96 matching lines @@
     return new Uint8List.fromList(_buffer.takeBytes());
   }
 
   void writeInt(int value) {
     _buffer.addByte((value & 0xFF000000) >> 24);
     _buffer.addByte((value & 0x00FF0000) >> 16);
     _buffer.addByte((value & 0x0000FF00) >> 8);
     _buffer.addByte(value & 0xFF);
   }
 }