}
protected DBObject transformFieldFilter(
final SingleFieldValueFilter<K, T> fieldFilter,
final MongoStore<K, T> store) {
MongoMapping mapping = store.getMapping();
String dbFieldName = mapping.getDocumentField(fieldFilter.getFieldName());
FilterOp filterOp = fieldFilter.getFilterOp();
List<Object> operands = fieldFilter.getOperands();
QueryBuilder builder = QueryBuilder.start(dbFieldName);