text: -- fts3c.test
  -- 
  -- db eval {
  --   DROP TABLE IF EXISTS t1;
  --   CREATE VIRTUAL TABLE t1 USING fts3(c);
  --   INSERT INTO t1 (docid, c) VALUES (1, 'This is a test');
  --   INSERT INTO t1 (docid, c) VALUES (2, 'That was a test');
  --   INSERT INTO t1 (docid, c) VALUES (3, 'This is a test');
  --   DELETE FROM t1 WHERE docid IN (1,3);
  --   DROP TABLE IF EXISTS t1old;
  --   ALTER TABLE t1 RENAME TO t1old;
  --   CREATE VIRTUAL TABLE t1 USING fts3(c);
  --   INSERT INTO t1 (docid, c) SELECT docid, c FROM t1old;
  --   DROP TABLE t1old;
  -- }
  DROP TABLE IF EXISTS t1;
  CREATE VIRTUAL TABLE t1 USING fts3(c);
  INSERT INTO t1 (docid, c) VALUES (1, 'This is a test');
  INSERT INTO t1 (docid, c) VALUES (2, 'That was a test');
  INSERT INTO t1 (docid, c) VALUES (3, 'This is a test');
  DELETE FROM t1 WHERE docid IN (1,3);
  DROP TABLE IF EXISTS t1old;
  ALTER TABLE t1 RENAME TO t1old;
  CREATE VIRTUAL TABLE t1 USING fts3(c);
  INSERT INTO t1 (docid, c) SELECT docid, c FROM t1old;
  DROP TABLE t1old;