Oracle ORA-39726 -- compress table drop column

Oracle ORA-39726 -- compress table drop column
--------------------------------------------------
ALTER TABLE <schema>.<table_name> SET UNUSED COLUMN <column_name>;
ALTER TABLE <schema>.<table_name> DROP UNUSED COLUMNS;

Reference:
39726, 00000, "unsupported add/drop column operation on compressed tables"
// *Cause:  An unsupported add/drop column operation for compressed table
//          was attemped.
// *Action: When adding a column, do not specify a default value.
//          DROP column is only supported in the form of SET UNUSED column
//          (meta-data drop column).