text: --Modify EVENT_PAYLOAD Column to BLOB
  ALTER TABLE PEN_RETRIEVAL_REQUEST_EVENT
      ADD (
          EVENT_PAYLOAD_BLOB BLOB
          ) LOB (EVENT_PAYLOAD_BLOB) STORE AS EVENT_PAYLOAD_BLOB (TABLESPACE API_PEN_RETRIEVAL_BLOB_DATA);
  UPDATE PEN_RETRIEVAL_REQUEST_EVENT SET EVENT_PAYLOAD_BLOB = UTL_RAW.CAST_TO_RAW(EVENT_PAYLOAD);
  ALTER TABLE PEN_RETRIEVAL_REQUEST_EVENT DROP COLUMN EVENT_PAYLOAD;
  ALTER TABLE PEN_RETRIEVAL_REQUEST_EVENT RENAME COLUMN EVENT_PAYLOAD_BLOB TO EVENT_PAYLOAD;
  ALTER TABLE PEN_RETRIEVAL_REQUEST_EVENT
      MODIFY (
          EVENT_PAYLOAD NOT NULL
          );
  