CREATE DOMAIN DMN_BLOBTXT AS
BLOB SUB_TYPE 1 SEGMENT SIZE 80 CHARACTER SET UTF8
COLLATE UTF8;
--------------------------------
CREATE TABLE TBL_MEDPOLICE (
...
    SERVICES_SET          DMN_BLOBTXT,
    SERVICES_SET_HASH     BIGINT,
...
);

SELECT
    SERVICES_SET
  , HASH(SERVICES_SET) AS HASH_BLOB_1
  , HASH(CAST(SERVICES_SET AS BLOB SUB_TYPE TEXT CHARACTER SET UTF8)) AS HASH_BLOB_2
  , HASH(
        CAST(
          CAST(SERVICES_SET AS BLOB SUB_TYPE TEXT CHARACTER SET UTF8) AS VARCHAR(8191)
            )
        ) AS HASH_BLOB_3
FROM TBL_MEDPOLICE