How to achieve calculating a hash value (binary checksum) of a complete table row?

Hi community,

I tried to calculate via an AMDP a binary checksum of a document (see example below). For this I used the hash function hash_sha256(). Now I face the question that I do not want to name every single field of the affected tables, but take all the fields of a table into account. How to achieve this? In MSSQL there is a handy function BINARY_CHECKSUM that does exactly this, but I haven't found a similar function in HANA. Is there something similar planned or how can this be done otherwise?

The example given is already more complex as I do not calculate a single row only, but multiple rows from different sources. Probably also for this there is a better approach than the one I used here.

Thanks,

Renzo

Example:

  METHOD mytest BY DATABASE FUNCTION FOR HDB LANGUAGE SQLSCRIPT OPTIONS READ-ONLY USING ekko ekpo.

    declare cursor c for select hash_sha256( to_binary(ebeln), to_binary(ebelp), to_binary(matnr) ) as hash FROM ekpo

                            WHERE mandt = session_context('CLIENT')

                            AND   ebeln = p_purchaseorder

                            ORDER BY ebelp;

    declare lt_hash table( hash varbinary(32) );

    declare lv_hash varbinary(32);

    lt_hash = SELECT hash_sha256( to_binary(ebeln), to_binary(bukrs), to_binary(bstyp), to_binary(bsart) ) as hash FROM ekko

      WHERE mandt = session_context('CLIENT')

      AND   ebeln = p_purchaseorder;

    FOR r as c DO

      select hash into lv_hash from :lt_hash;

      lt_hash = SELECT hash_sha256( lv_hash, r.hash ) as hash FROM dummy;

    END for;

    RETURN SELECT session_context('CLIENT') as Client, hash as HashValue FROM :lt_hash;

  ENDMETHOD.