text: -- original: skipscan5.test
  -- credit:   http://www.sqlite.org/src/tree?ci=trunk&name=test
  
  CREATE TABLE t1(a INT, b INT, c INT);
    CREATE INDEX i1 ON t1(a, b)
  ;INSERT INTO t1 VALUES(sub_a, sub_b, NULL)
  ;INSERT INTO t2 VALUES(sub_a, sub_b, sub_c, sub_d)
  ;CREATE TABLE t3(a, b, c);
    CREATE INDEX i3 ON t3(a, b)
  ;INSERT INTO t3 VALUES(sub_c % 2, sub_v, sub_c);