create or replace function methods( type ) as table (
  select function_name, parameter_types
  from duckdb_functions()
  where upper(parameter_types[1]) = upper(type)
  order by function_name
);

create or replace function functions_with_signature( ds ) as table (
  with uc as (select list_transform(ds, x->upper(x)) as uc)
  select function_name
  from duckdb_functions(), uc
  where list_transform(parameter_types, x->upper(x)) = uc
  order by function_name
);