@Override
 public void prepare(MetadataRepository repository, boolean dropExistingData) {
   // Nothing to do
   prepare(repository, Collections.<Expression>emptySet(), false, true);
 }
 @Override
 public Set<String> getFullTextSuggestion(
     String keyword, FullTextSuggestion mode, int suggestionSize) {
   return Collections.emptySet();
 }