Ok Nupur try to tell you. Generated columns means you want to display current values of a column based on some formulae like below:
ALTER TABLE "<your_schema>"."<your_dimension_table>" add ( <calculated_attribute_name> varchar GENERATED ALWAYS AS (<formula>));
e.g. Ex - ALTER TABLE TEST ADD curdate date GENERATED ALWAYS AS current_date
For more regarding performance of generated column follow below link.
Dynamically calculated columns on HANA tables | SCN
Br
Sumeet