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1select 'pg_database_size(oid)'::regprocedure; -- create "reference"
2     regprocedure      
3-----------------------
4 pg_database_size(oid)
5	
6CREATE OR REPLACE FUNCTION public.get_function_fields(fn_name character varying)
7    ...
8    ...
9	
10EXECUTE 'create temp table if not exists temp_call as select * from ' || fn_name::regproc || '() limit 1';