boolean function ( ) { return rows . isEmpty ( ) ; }
checks if this query result has any rows . concode_field_sep Map<String,String> columns concode_elem_sep Map<String,String> values concode_elem_sep List<Row> rows concode_field_sep String getValue concode_elem_sep Iterator<Row> iterator concode_elem_sep List<Row> getRows concode_elem_sep Map<String,String> getColumns