在aws redshift中替代UDF

I am creating views on a redshift table, but would like to have some sort of argument that I can pass to limit the data I get back from the view. The table is for the whole month and joins take a lot of time. I looked into redshift documentation but it says that redshift doesnot support user-defined functions. Is there any alternative to choose besides views/UDF....I am creating views on a redshift table, but wo