public boolean isGroupColumn(String columnName){
  if (columnName == null || m_groups.size() == 0)   return false;
  for (int i=0; i < m_groups.size(); i++) {
    if (columnName.equals(m_groups.get(i)))     return true;
  }
  return false;
}

public boolean isGroupColumn ( String columnName ) { if ( columnName == null || m_groups . size ( ) == 0 ) return false ; for ( int i = 0 ; i < m_groups . size ( ) ; i ++ ) { if ( columnName . equals ( m_groups . get ( i ) ) ) return true ; } return false ; }
column has a function
