After hours of search, I searched just some more and I think I found the
solution, hope it can be useful to someone else :
CREATE LANGUAGE plperlu;
CREATE FUNCTION test_perl_external (integer) RETURNS boolean AS $$
$filename = '/tmp/somefile';
if (-e $filename) { return true; }
return false;
$$ LANGUAGE plperlu;
SELECT test_perl_external(1);
Just remember that anything run like that, won't rollback in a transaction.
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