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CREATE EXTENSION ltree_plpython3u CASCADE;
NOTICE: installing required extension "plpython3u"
CREATE FUNCTION test1(val ltree) RETURNS int
LANGUAGE plpython3u
TRANSFORM FOR TYPE ltree
AS $$
plpy.info(repr(val))
return len(val)
$$;
SELECT test1('aa.bb.cc'::ltree);
INFO: ['aa', 'bb', 'cc']
test1
-------
3
(1 row)
CREATE FUNCTION test1n(val ltree) RETURNS int
LANGUAGE plpython3u
TRANSFORM FOR TYPE ltree
AS $$
plpy.info(repr(val))
return len(val)
$$;
SELECT test1n('aa.bb.cc'::ltree);
INFO: ['aa', 'bb', 'cc']
test1n
--------
3
(1 row)
CREATE FUNCTION test2() RETURNS ltree
LANGUAGE plpython3u
TRANSFORM FOR TYPE ltree
AS $$
return ['foo', 'bar', 'baz']
$$;
-- plpython to ltree is not yet implemented, so this will fail,
-- because it will try to parse the Python list as an ltree input
-- string.
SELECT test2();
ERROR: ltree syntax error at character 1
CONTEXT: while creating return value
PL/Python function "test2"
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