text: -- fts3d.test
  -- 
  -- db eval {
  --   DROP TABLE IF EXISTS t1;
  --   CREATE VIRTUAL TABLE t1 USING fts3(c);
  -- 
  --   INSERT INTO t1 (rowid, c) VALUES (1, 'This is a test');
  --   INSERT INTO t1 (rowid, c) VALUES (2, 'That was a test');
  --   INSERT INTO t1 (rowid, c) VALUES (3, 'This is a test');
  -- 
  --   UPDATE t1 SET c = 'This is a test one' WHERE rowid = 1;
  --   UPDATE t1 SET c = 'That was a test one' WHERE rowid = 2;
  --   UPDATE t1 SET c = 'This is a test one' WHERE rowid = 3;
  -- 
  --   UPDATE t1 SET c = 'This is a test two' WHERE rowid = 1;
  --   UPDATE t1 SET c = 'That was a test two' WHERE rowid = 2;
  --   UPDATE t1 SET c = 'This is a test two' WHERE rowid = 3;
  -- 
  --   UPDATE t1 SET c = 'This is a test three' WHERE rowid = 1;
  --   UPDATE t1 SET c = 'That was a test three' WHERE rowid = 2;
  --   UPDATE t1 SET c = 'This is a test three' WHERE rowid = 3;
  -- 
  --   UPDATE t1 SET c = 'This is a test four' WHERE rowid = 1;
  --   UPDATE t1 SET c = 'That was a test four' WHERE rowid = 2;
  --   UPDATE t1 SET c = 'This is a test four' WHERE rowid = 3;
  -- 
  --   UPDATE t1 SET c = 'This is a test' WHERE rowid = 1;
  --   UPDATE t1 SET c = 'That was a test' WHERE rowid = 2;
  --   UPDATE t1 SET c = 'This is a test' WHERE rowid = 3;
  -- }
  DROP TABLE IF EXISTS t1;
  CREATE VIRTUAL TABLE t1 USING fts3(c);
  INSERT INTO t1 (rowid, c) VALUES (1, 'This is a test');
  INSERT INTO t1 (rowid, c) VALUES (2, 'That was a test');
  INSERT INTO t1 (rowid, c) VALUES (3, 'This is a test');
  UPDATE t1 SET c = 'This is a test one' WHERE rowid = 1;
  UPDATE t1 SET c = 'That was a test one' WHERE rowid = 2;
  UPDATE t1 SET c = 'This is a test one' WHERE rowid = 3;
  UPDATE t1 SET c = 'This is a test two' WHERE rowid = 1;
  UPDATE t1 SET c = 'That was a test two' WHERE rowid = 2;
  UPDATE t1 SET c = 'This is a test two' WHERE rowid = 3;
  UPDATE t1 SET c = 'This is a test three' WHERE rowid = 1;
  UPDATE t1 SET c = 'That was a test three' WHERE rowid = 2;
  UPDATE t1 SET c = 'This is a test three' WHERE rowid = 3;
  UPDATE t1 SET c = 'This is a test four' WHERE rowid = 1;
  UPDATE t1 SET c = 'That was a test four' WHERE rowid = 2;
  UPDATE t1 SET c = 'This is a test four' WHERE rowid = 3;
  UPDATE t1 SET c = 'This is a test' WHERE rowid = 1;
  UPDATE t1 SET c = 'That was a test' WHERE rowid = 2;
  UPDATE t1 SET c = 'This is a test' WHERE rowid = 3;