Creating a relation on the fly

[rakesh sharma]

Hi All,
I have a situation where I need to create a relation by a combination of UDF 
and parameter values. For example, first field will be generated by UDF 
UUIDGenerator, second field by parameter p1, and third field by parameter p2. I 
am looking some way of having a relation window as expressed below:
window = generate UUIDGenerator() as uuid, '$p1' as value1, '$p2' as value2;
Any idea how it can be done.
Thanks,Rakesh