[BUGS] BUG #14834: quote_literal and composite types,different behaviour between sql and plpgsql

The following bug has been logged on the website:

Bug reference:      14834
Logged by:          David Mugnai
Email address:      dvd@gnx.it
PostgreSQL version: 9.4.7
Operating system:   Linux
Description:

I found that `quote_literal` behaviour is wrong when used in a plpgsql
function over a null composite type, let me show:


create type t as (x text);

create function f(val t default null) returns text as $$select quote_literal(val);
$$ language sql stable;

create function f2(val t default null) returns text as $$
declareo text;
beginselect quote_literal(val) into o;return o;
end
$$ language plpgsql;

dvd@[local]/dvd> select f() union all select f2();  f
--------(null)'()'
(2 rows)


If I do not mistake the both the functions should returns NULL;


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