How access to array component

Hello  How access to especific array component
of an function with return type _varchar
  declaration of my function:
>>>  create or replace __function( int2, int2 ) returns _varchar ....
  now use the function in SQL and access to the element 1...
>>>  select __function(10::int2, 20::int2)[1]                  ^^^ parsing error.
  Thanks.


Cristian Cappo
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