Hi Jayakrishnan,
I faced the same issue with Analytical Table type of Smart table.
What helped for me that I added the following aggregation to the EntityType level:
sap:semantics="aggregate"
and to each Property of this EntityType you expose I added:
sap:aggregation-role="dimension"
I was also looking at this demo kit smart table + analytical
and fetched the metadata.xml through the Network..
Hope it will help you
Regards,
Vered