Rank/Row Number function in CDS

Hi Gurus,

I have a couple of questions..

1 Is there any alternative for ROW_NUMBER,RANK and DENSE_RANK functions in CDS view .I know that it will be supported by CDS table functions where AMDP procedures can be called within CDS . But we are currently on 7.4

2  How can I pass parameters to CDS views dynamically in open SQL  .The CDS view name and parameter name is also dynamic

Regards

Arshad