text: -- original: fts2f.test
  -- credit:   http://www.sqlite.org/src/tree?ci=trunk&name=test
  
  CREATE VIRTUAL TABLE t1 USING fts2(content);
    INSERT INTO t1 (rowid, content) VALUES(1, 'one');
    INSERT INTO t1 (rowid, content) VALUES(2, 'two');
    INSERT INTO t1 (rowid, content) VALUES(3, 'one two');
    INSERT INTO t1 (rowid, content) VALUES(4, 'three');
    INSERT INTO t1 (rowid, content) VALUES(5, 'one three');
    INSERT INTO t1 (rowid, content) VALUES(6, 'two three');
    INSERT INTO t1 (rowid, content) VALUES(7, 'one two three');
    DELETE FROM t1 WHERE rowid = 4;
    INSERT INTO t1 (rowid, content) VALUES(8, 'four');
    UPDATE t1 SET content = 'update one three' WHERE rowid = 1;
    INSERT INTO t1 (rowid, content) VALUES(9, 'one four');
    INSERT INTO t1 (rowid, content) VALUES(10, 'two four');
    DELETE FROM t1 WHERE rowid = 7;
    INSERT INTO t1 (rowid, content) VALUES(11, 'one two four');
    INSERT INTO t1 (rowid, content) VALUES(12, 'three four');
    INSERT INTO t1 (rowid, content) VALUES(13, 'one three four');
    DELETE FROM t1 WHERE rowid = 10;
    INSERT INTO t1 (rowid, content) VALUES(14, 'two three four');
    INSERT INTO t1 (rowid, content) VALUES(15, 'one two three four');
    UPDATE t1 SET content = 'update two five' WHERE rowid = 8;
    INSERT INTO t1 (rowid, content) VALUES(16, 'five');
    DELETE FROM t1 WHERE rowid = 13;
    INSERT INTO t1 (rowid, content) VALUES(17, 'one five');
    INSERT INTO t1 (rowid, content) VALUES(18, 'two five');
    INSERT INTO t1 (rowid, content) VALUES(19, 'one two five');
    DELETE FROM t1 WHERE rowid = 16;
    INSERT INTO t1 (rowid, content) VALUES(20, 'three five');
    INSERT INTO t1 (rowid, content) VALUES(21, 'one three five');
    INSERT INTO t1 (rowid, content) VALUES(22, 'two three five');
    DELETE FROM t1 WHERE rowid = 19;
    UPDATE t1 SET content = 'update' WHERE rowid = 15
  ;SELECT COUNT(*) FROM t1
  ;SELECT rowid FROM t1 WHERE content MATCH 'update'
  ;SELECT rowid FROM t1 WHERE content MATCH 'one'
  ;SELECT rowid FROM t1 WHERE content MATCH 'two'
  ;SELECT rowid FROM t1 WHERE content MATCH 'three'
  ;SELECT rowid FROM t1 WHERE content MATCH 'four'
  ;SELECT rowid FROM t1 WHERE content MATCH 'five';