Using HANA SQL Functions in select list of CDS Views

Dear Expert,
Kindly please let me know if we can use the HANA SQL Function (Ex: ADD_DAYS, SECONDS_BETWEEN) in the select list of CDS Views?
If I create a CDS like below I get error that timestamp is not supported.
For Example:
@AbapCatalog.sqlViewName: 'ZMR_H_CA'
@EndUserText.label: 'CAG A'
define view viewname
with parameters start_ts:abap.dec( 15, 0 ) , end_ts:abap.dec( 15, 0 )
as select from table {
key resource_key,
TO_TIMESTAMP(begtstmp) as start_tmp,
TO_TIMESTAMP(begtstmp) as end_tmp
where
(begtstmp > $parameters.start_ts or endtstmp > $parameters.start_ts )
and
(begtstmp < $parameters.end_ts or endtstmp < $parameters.end_ts )
Thanks,
Giri

Hi Giri,
the list of provided features can be found in the ABAP Language Documentation (F1 in the CDS View).
As CDS in ABAP is abstracted from the database layer, the database features are not directly accessible. That means, you cannot use any HANA or MaxDB feature available. So the answer to your question is no. The reason for this is, that ABAP CDS views can be created on all SAP-supported databases, hence, we can only provide those features, supported by all databases.
Having said this, there are some exception, e.g. the CDS views with input parameters, which are not supported by all databases. In these cases, you'd have to additionally use the utility class CL_ABAP_DBFEATURES (see http://scn.sap.com/community/abap/blog/2014/10/10/abap-news-for-740-sp08--abap-core-data-services-cds) for more details.
Best,
Jasmin

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Please have a look at below link. It will help you.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed06446011d189700000e8322d00/frameset.htm
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https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/abap+dictionary&
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8 ),
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17          then curr_date
18          else null
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PERIOD                                             PAID_UNPAID
01-JUL-08 - 01-JUL-09                              Y
02-JUL-09 - 25-JUL-09                              N
26-JUL-09 - 01-JAN-10                              Y
02-JAN-10 - 13-JAN-10                              N
14-JAN-10 - 18-JAN-10                              Y
19-JAN-10 - 30-APR-10                              N
6 rows selected.
Elapsed: 00:00:00.35

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