CREATE EXTENSION bool_plperlu CASCADE;
NOTICE:  installing required extension "plperlu"
--- test transforming from perl
CREATE FUNCTION perl2int(int) RETURNS bool
LANGUAGE plperlu
TRANSFORM FOR TYPE bool
AS $$
return shift;
$$;
CREATE FUNCTION perl2text(text) RETURNS bool
LANGUAGE plperlu
TRANSFORM FOR TYPE bool
AS $$
return shift;
$$;
CREATE FUNCTION perl2undef() RETURNS bool
LANGUAGE plperlu
TRANSFORM FOR TYPE bool
AS $$
return undef;
$$;
SELECT perl2int(1);
 perl2int 
----------
 t
(1 row)

SELECT perl2int(0);
 perl2int 
----------
 f
(1 row)

SELECT perl2text('foo');
 perl2text 
-----------
 t
(1 row)

SELECT perl2text('');
 perl2text 
-----------
 f
(1 row)

SELECT perl2undef() IS NULL AS p;
 p 
---
 t
(1 row)

--- test transforming to perl
CREATE FUNCTION bool2perl(bool, bool, bool) RETURNS void
LANGUAGE plperlu
TRANSFORM FOR TYPE bool, for type boolean  -- duplicate to test ruleutils
AS $$
my ($x, $y, $z) = @_;

die("NULL mistransformed") if (defined($z));
die("TRUE mistransformed to UNDEF") if (!defined($x));
die("FALSE mistransformed to UNDEF") if (!defined($y));
die("TRUE mistransformed") if (!$x);
die("FALSE mistransformed") if ($y);
$$;
SELECT bool2perl (true, false, NULL);
 bool2perl 
-----------
 
(1 row)

--- test ruleutils
\sf bool2perl
CREATE OR REPLACE FUNCTION public.bool2perl(boolean, boolean, boolean)
 RETURNS void
 TRANSFORM FOR TYPE boolean, FOR TYPE boolean
 LANGUAGE plperlu
AS $function$
my ($x, $y, $z) = @_;

die("NULL mistransformed") if (defined($z));
die("TRUE mistransformed to UNDEF") if (!defined($x));
die("FALSE mistransformed to UNDEF") if (!defined($y));
die("TRUE mistransformed") if (!$x);
die("FALSE mistransformed") if ($y);
$function$
--- test selecting bool through SPI
CREATE FUNCTION spi_test()  RETURNS void
LANGUAGE plperlu
TRANSFORM FOR TYPE bool
AS $$
my $rv = spi_exec_query('SELECT true t, false f, NULL n')->{rows}->[0];

die("TRUE mistransformed to UNDEF in SPI") if (!defined ($rv->{t}));
die("FALSE mistransformed to UNDEF in SPI") if (!defined ($rv->{f}));
die("NULL mistransformed in SPI") if (defined ($rv->{n}));
die("TRUE mistransformed in SPI") if (!$rv->{t});
die("FALSE mistransformed in SPI") if ($rv->{f});
$$;
SELECT spi_test();
 spi_test 
----------
 
(1 row)

DROP EXTENSION plperlu CASCADE;
NOTICE:  drop cascades to 6 other objects
DETAIL:  drop cascades to function spi_test()
drop cascades to extension bool_plperlu
drop cascades to function perl2int(integer)
drop cascades to function perl2text(text)
drop cascades to function perl2undef()
drop cascades to function bool2perl(boolean,boolean,boolean)