1.7.24 CQL: Disjunction resulting in different joins (implemented as a SQL UNION)

{[],
 se_lt_x :: [a-A, c-C]
 =*=
 (se_lt_y :: [d-A] ; se_lt_z :: [g-A])}

The generated SQL is:

SELECT
  x43.c
 FROM
  (se_lt_x x43 INNER JOIN se_lt_z z6 ON x43.a=z6.g AND z6.g=x43.a)

UNION

SELECT
  x44.c
 FROM
  (se_lt_x x44 INNER JOIN se_lt_y y16 ON x44.a=y16.d AND y16.d=x44.a)