item_create.h

/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

   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 */

/* Functions to create an item. Used by sql/sql_yacc.yy */

#ifndef ITEM_CREATE_H
#define ITEM_CREATE_H

typedef struct st_udf_func udf_func;

class Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list) = 0;

protected:
  Create_func() {}
  virtual ~Create_func() {}
};


class Create_qfunc : public Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list);

  virtual Item* create(THD *thd, LEX_STRING db, LEX_STRING name,
                       bool use_explicit_name, List<Item> *item_list) = 0;

protected:
  Create_qfunc() {}
  virtual ~Create_qfunc() {}
};


extern Create_func * find_native_function_builder(THD *thd, LEX_STRING name);


extern Create_qfunc * find_qualified_function_builder(THD *thd);


#ifdef HAVE_DLOPEN

class Create_udf_func : public Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list);

  Item *create(THD *thd, udf_func *fct, List<Item> *item_list);

  static Create_udf_func s_singleton;

protected:
  Create_udf_func() {}
  virtual ~Create_udf_func() {}
};
#endif


Item *
create_func_cast(THD *thd, Item *a, Cast_target cast_type,
                 const char *len, const char *dec,
                 const CHARSET_INFO *cs);

Item *create_temporal_literal(THD *thd,
                              const char *str, uint length,
                              const CHARSET_INFO *cs,
                              enum_field_types type, bool send_error);

int item_create_init();
void item_create_cleanup();

#endif