Merge pnousiainen@bk-internal.mysql.com:/home/bk/mysql-5.0-ndb

  // scan direction

  const unsigned idir = scan.m_descending; // 0, 1

  const int jdir = 1 - 2 * (int)idir;      // 1, -1

  unpackBound(*scan.m_bound[1 - idir], c_dataBuffer);

  // use copy of position

  TreePos pos = scan.m_scanPos;

  // get and remember original node