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36058a3c55
plperl's default handling of bool arguments or results is not terribly satisfactory, since Perl doesn't consider the string 'f' to be false. Ideally we'd just fix that, but the backwards-compatibility hazard would be substantial. Instead, build a TRANSFORM module that can be optionally applied to provide saner semantics. Perhaps usefully, this is also about the minimum possible skeletal example of a plperl transform module; so it might be a better starting point for user-written transform modules than hstore_plperl or jsonb_plperl. Ivan Panchenko Discussion: https://postgr.es/m/1583013317.881182688@f390.i.mail.ru
67 lines
1.5 KiB
PL/PgSQL
67 lines
1.5 KiB
PL/PgSQL
CREATE EXTENSION bool_plperl CASCADE;
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--- test transforming from perl
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CREATE FUNCTION perl2int(int) RETURNS bool
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LANGUAGE plperl
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TRANSFORM FOR TYPE bool
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AS $$
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return shift;
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$$;
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CREATE FUNCTION perl2text(text) RETURNS bool
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LANGUAGE plperl
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TRANSFORM FOR TYPE bool
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AS $$
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return shift;
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$$;
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CREATE FUNCTION perl2undef() RETURNS bool
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LANGUAGE plperl
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TRANSFORM FOR TYPE bool
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AS $$
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return undef;
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$$;
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SELECT perl2int(1);
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SELECT perl2int(0);
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SELECT perl2text('foo');
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SELECT perl2text('');
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SELECT perl2undef() IS NULL AS p;
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--- test transforming to perl
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CREATE FUNCTION bool2perl(bool, bool, bool) RETURNS void
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LANGUAGE plperl
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TRANSFORM FOR TYPE bool
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AS $$
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my ($x, $y, $z) = @_;
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die("NULL mistransformed") if (defined($z));
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die("TRUE mistransformed to UNDEF") if (!defined($x));
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die("FALSE mistransformed to UNDEF") if (!defined($y));
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die("TRUE mistransformed") if (!$x);
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die("FALSE mistransformed") if ($y);
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$$;
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SELECT bool2perl (true, false, NULL);
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--- test selecting bool through SPI
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CREATE FUNCTION spi_test() RETURNS void
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LANGUAGE plperl
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TRANSFORM FOR TYPE bool
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AS $$
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my $rv = spi_exec_query('SELECT true t, false f, NULL n')->{rows}->[0];
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die("TRUE mistransformed to UNDEF in SPI") if (!defined ($rv->{t}));
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die("FALSE mistransformed to UNDEF in SPI") if (!defined ($rv->{f}));
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die("NULL mistransformed in SPI") if (defined ($rv->{n}));
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die("TRUE mistransformed in SPI") if (!$rv->{t});
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die("FALSE mistransformed in SPI") if ($rv->{f});
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$$;
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SELECT spi_test();
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DROP EXTENSION plperl CASCADE;
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