Dynamically execute query using the output of another query

Question

I have a function called generate_table, that takes 2 input parameters (rundate::date and branch::varchar)

Now I am trying to work on a second

Answer 1

No need to do anything too fancy.

SELECT generate_table(rundate,branch) FROM (
    SELECT max(rundate) AS rundate, branch
    FROM t_index_of_imported_files
    GROUP BY branch) x;