[BP to 7.2.0 MB-54495] ORDER BY after UNION requires explicitly aliased terms

upsert into default.s1.c1 values("k0",{"a":1,"b":1}),("k1",{"a":3,"b":3});

upsert into default.s1.c2 values("k0",{"a":2,"b":2}),("k1",{"a":4,"b":4});

(SELECT a, b FROM default.s1.c1)

UNION

(SELECT a, b FROM default.s1.c2)

ORDER BY b

;