Hello Manu,
I am not sure why you are specifying /Results and I am assuming InputParams the name of your entity specified in the odata service? I tried to perform what you are doing, and the below command worked for me
http://server:port/path/service.xsodata/ENTITY_NAME(KEY1='VALUE1',KEY2='VALUE2')?$select=FIELD1,FIELD2,FIELD3
The values specified in your input parameters must be all the keys you specify in the odata service. Specifying non keys in addition with keys did not work for me. Using the above command I was able to select FIELD1, FIELD2 and FIELD3.
Hope this helps.
Kind Regards,
Sharan Chama