public ColumnEntry(int col,Column column,ColumnMetadata metadata){
  this.colnum=col;
  this.column=column;
  this.metadata=metadata;
  this.index=null;
}

public ColumnEntry ( int col , Column column , ColumnMetadata metadata ) { this . colnum = col ; this . column = column ; this . metadata = metadata ; this . index = null ; }
create a new columnentry .
