private <T> void searchIndex(TxnId txnId, IMetadataIndex index, ITupleReference searchKey, IValueExtractor<T> valueExtractor, List<T> results) throws AlgebricksException, HyracksDataException, RemoteException { IBinaryComparatorFactory[] comparatorFactories = index.getKeyBinaryComparatorFactory(); if (index.getFile() == null) { throw new AlgebricksException("No file for Index " + index.getDataverseName() + "." + index.getIndexName()); } String resourceName = index.getFile().getRelativePath(); IIndex indexInstance = datasetLifecycleManager.get(resourceName); datasetLifecycleManager.open(resourceName); IIndexAccessor indexAccessor = indexInstance.createAccessor(NoOpIndexAccessParameters.INSTANCE); try { IBinaryComparator[] searchCmps = null; MultiComparator searchCmp = null; if (searchKey != null) { searchCmps = new IBinaryComparator[searchKey.getFieldCount()]; for (int i = 0; i < searchKey.getFieldCount(); i++) { searchCmps[i] = comparatorFactories[i].createBinaryComparator(); } searchCmp = new MultiComparator(searchCmps); } RangePredicate rangePred = new RangePredicate(searchKey, searchKey, true, true, searchCmp, searchCmp); search(indexAccessor, rangePred, results, valueExtractor, txnId); } finally { indexAccessor.destroy(); } datasetLifecycleManager.close(resourceName); }