'postgres public schema function aliasing

I am currently running postgres 8.4.4 and I have the need to override calls to functions that reside in the public schema of my database. For instance in pg_catalog there exists a function

upper(text)

I have a function placed within the public schema that overrides

upper(text)

My question comes down to overriding the call to public.upper(text). That is to say I have to execute the function call like so:

select public.upper(text);

Whereas I want to be able to call public.upper(text) in this manner:

select upper(text);

How does one go about doing this?

sqlpostgresqlfunction


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