public Updater updaterFor(DecoratedKey key,ColumnFamily cf,OpOrder.Group opGroup){
  return (indexesByColumn.isEmpty() && rowLevelIndexMap.isEmpty()) ? nullUpdater : new StandardUpdater(key,cf,opGroup);
}

public Updater updaterFor ( DecoratedKey key , ColumnFamily cf , OpOrder . Group opGroup ) { return ( indexesByColumn . isEmpty ( ) && rowLevelIndexMap . isEmpty ( ) ) ? nullUpdater : new StandardUpdater ( key , cf , opGroup ) ; }
this helper acts as a closure around the indexmanager and updated cf data to ensure that down in memtable ' s columnfamily implementation , the index can get updated . note : only a cf backed by atomicsortedcolumns implements this behaviour fully , other types simply ignore the index updater .
