Optimizer support for Multi-Valued indexes: support new Full Text Search

class hlindex : public Sql_alloc

{

public:

  hlindex(TABLE *t) : table(t) { }

  virtual int insert_row(TABLE *tbl, KEY *keyinfo) = 0;

  // This takes the condition and initializes a scan to read the records:

  virtual int read_init(TABLE *tbl, KEY *keyinfo, Item *dist, ulonglong limit) = 0;

  virtual int read_next(TABLE *tbl) = 0;

  virtual int read_end(TABLE *tbl) = 0;

  virtual int delete_row(TABLE *tbl, const uchar *rec, KEY *keyinfo) = 0;

  virtual int delete_all(TABLE *tbl, KEY *keyinfo, bool truncate) = 0;

  virtual bool reading() = 0;

  virtual ~hlindex();

  TABLE *table;

}

virtual cost_of_read(TABLE *tbl, KEY *keyinfo, Item *dist, ulonglong limit, COST *cost, ha_rows *rows) = 0;