code: public Array listToArray() throws PageException {
  
  	if (this.query instanceof QueryImpl) return ListUtil.listToArray(((QueryImpl) this.query).getColumnlist(false), ",");
  
  	throw new ApplicationException("Query is not of type QueryImpl. Use instead Query.columnArray() or Query.columnList().listToArray().");
      }
docs: This method was added for ACF compatibility per LDEV-1142 and should be avoided if cross engine
  code is not required. Use instead Query.columnArray() or Query.columnList().listToArray().
  
  @return an Array of the names of columns
  @throws PageException