[GENERAL] how to found a variable is in a aggregation or not?

[Yi Zhao]

I want to check a variable is in a aggregattion or not, so I create a
function as below:

create or replace function anytest(val text) returns boolean as $$
begin
        perform 1 where quote_literal(val) in ('hello', 'world', 'test');
        if not found then
                return false;
        else
                return true;
        end if;
end;
$$ language plpgsql;

but when I used, I got the result below, why?

test=# select anytest('world111');
 anytest 
---------
 f
(1 row)

test=# select anytest('world');   
 anytest 
---------
 f
(1 row)


any help is appreciated.

regards,
Zy


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