Fix validation of indexes on composite column components of COMPACT tables

CREATE TABLE users2 (
   userID uuid,
   fname text,
   zip int,
   state text,
  PRIMARY KEY ((userID, fname))
) WITH COMPACT STORAGE;

CREATE INDEX ON users2 (userID);
CREATE INDEX ON users2 (fname);

INSERT INTO users2 (userID, fname, zip, state) VALUES (b3e3bc33-b237-4b55-9337-3d41de9a5649, 'John', 10007, 'NY');

-- the following queries returns 0 rows, instead of 1 expected
SELECT * FROM users2 WHERE fname='John'; 
SELECT * FROM users2 WHERE userid=b3e3bc33-b237-4b55-9337-3d41de9a5649;
SELECT * FROM users2 WHERE userid=b3e3bc33-b237-4b55-9337-3d41de9a5649 AND fname='John';

-- dropping 2ndary indexes restore normal behavior