SAP HANA PROBLEM PERFORMANCE NVARCHAR

Hello,

We are using dg4odbc to connect to sap hana database.

Our problem is regarding performance.

My queries is only working well when I cast each parameter in where clause to include cast as nvarchar.

For example:

--This query is not running because the where clause is applied only after oracle bring full hana table to oracle side

select * from saphanadb.bsad@saphana_link

where bukrs = '0060'

and kunnr = '0000013580'

and augdt = '20200813'

--The same query but including cast as nvarchar2 works fine.

select * from saphanadb.bsad@saphana_link

where bukrs = CAST('0060' AS NVARCHAR2(100))