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WITH t AS ( SELECT * FROM (VALUES (1, 2) , (3, 4) ) x(id1, id2) ) SELECT t.*, x.* FROM t CROSS JOIN LATERAL (VALUES(t.id1),(t.id2)) x(id3)
id1
id2
id3
1
2
1
1
2
2
3
4
3
3
4
4
SELECT 4