void removeEntry(VeriniceGraphResultEntry e) {
   log.debug("remove it self: " + e.getColumnKey());
   entries.remove(e.getColumnKey());
 }
 void addEntry(VeriniceGraphResultEntry e) {
   entries.put(e.getColumnKey(), e);
   e.add(this);
 }
  Map<String, String> getExpandedRow() {
    Map<String, String> row = new HashMap<>();
    for (VeriniceGraphResultEntry e : entries.values()) if (e != null) e.getEntries(row);

    return row;
  }
 boolean contains(VeriniceGraphResultEntry e) {
   return entries.containsKey(e.getColumnKey());
 }