CREATE TABLE t0 (c0  , c1 , c2  , c3  );
CREATE INDEX i8 ON t0(c1) WHERE (    'default');
INSERT INTO t0      VALUES (894, 89, 'unique_0_578', 'unique_0_359')                                                               ;
SELECT       COALESCE( (  c0)         , 9) FROM t0 WHERE (t0.c1) IN (SELECT  c1 FROM t0)