~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#ifndef DRIZZLED_FUNCTION_ROLLUP_CONST_H

#define DRIZZLED_FUNCTION_ROLLUP_CONST_H

#include <drizzled/function/func.h>

/*

  Objects of this class are used for ROLLUP queries to wrap up

  each constant item referred to in GROUP BY list.

*/

class Item_func_rollup_const :public Item_func

{

public:

  Item_func_rollup_const(Item *a) :Item_func(a)

  {

    name= a->name;

    name_length= a->name_length;

  }

  double val_real() { return args[0]->val_real(); }

  int64_t val_int() { return args[0]->val_int(); }

  String *val_str(String *str) { return args[0]->val_str(str); }

  my_decimal *val_decimal(my_decimal *dec) { return args[0]->val_decimal(dec); }

  const char *func_name() const { return "rollup_const"; }

  bool const_item() const { return 0; }

  Item_result result_type() const { return args[0]->result_type(); }

  void fix_length_and_dec()

  {

    collation= args[0]->collation;

    max_length= args[0]->max_length;

    decimals=args[0]->decimals;

    /* The item could be a NULL constant. */

    null_value= args[0]->is_null();

  }

};

#endif /* DRIZZLED_FUNCTION_ROLLUP_CONST_H */