ERROR: could not devise a query plan for the given query (UNIONS and LATERAL)

Hi,

The following (admittedly bizzare) query causes the error in the subject
on all recent versions of Postgres:

SELECT
"q2"."v"
FROM
LATERAL
(SELECT
"q11"."v"
FROM
(
(SELECT 2::bigint AS "v") UNION ALL
(SELECT 3::bigint AS "v")
) AS "q11"
) AS "q1"
CROSS JOIN LATERAL
(
(SELECT
"q3"."v"
FROM
(
(SELECT 4::bigint AS "v") UNION ALL
(SELECT 5::bigint AS "v")
) AS "q3"
)
UNION ALL
(SELECT "q1"."v")
) AS "q2"
ORDER BY
"q2"."v";

Interestingly, removing UNION from either "q3" or "q11", as well as
removing the ::bigint casts makes it work.

Elvis