I have raw call log data and the logs don't have a unique id number so I generate a uuid4 number when i load them using spark.  Now I want to save the records to a table, and run a COPY INTO command every day to ingest new records.  I am only appending new records, never updating, and I want to generate the uuid column on the COPY INTO command the same way I do when i read the files into the dataframe.  Is this possible?