/*
   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
*/

/**
  @file

  @brief
  Functions to create an item. Used by sql_yac.yy
*/

#include "mysql_priv.h"
#include "item_create.h"
#include "sp_head.h"
#include "sp.h"

/*
=============================================================================
  LOCAL DECLARATIONS
=============================================================================
*/

/**
  Adapter for native functions with a variable number of arguments.
  The main use of this class is to discard the following calls:
  <code>foo(expr1 AS name1, expr2 AS name2, ...)</code>
  which are syntactically correct (the syntax can refer to a UDF),
  but semantically invalid for native functions.
*/

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

  /**
    Builder method, with no arguments.
    @param thd The current thread
    @param name The native function name
    @param item_list The function parameters, none of which are named
    @return An item representing the function call
  */
  virtual Item *create_native(THD *thd, LEX_STRING name,
                              List<Item> *item_list) = 0;

protected:
  /** Constructor. */
  Create_native_func() {}
  /** Destructor. */
  virtual ~Create_native_func() {}
};


/**
  Adapter for functions that takes exactly zero arguments.
*/

class Create_func_arg0 : public Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list);

  /**
    Builder method, with no arguments.
    @param thd The current thread
    @return An item representing the function call
  */
  virtual Item *create(THD *thd) = 0;

protected:
  /** Constructor. */
  Create_func_arg0() {}
  /** Destructor. */
  virtual ~Create_func_arg0() {}
};


/**
  Adapter for functions that takes exactly one argument.
*/

class Create_func_arg1 : public Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list);

  /**
    Builder method, with one argument.
    @param thd The current thread
    @param arg1 The first argument of the function
    @return An item representing the function call
  */
  virtual Item *create(THD *thd, Item *arg1) = 0;

protected:
  /** Constructor. */
  Create_func_arg1() {}
  /** Destructor. */
  virtual ~Create_func_arg1() {}
};


/**
  Adapter for functions that takes exactly two arguments.
*/

class Create_func_arg2 : public Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list);

  /**
    Builder method, with two arguments.
    @param thd The current thread
    @param arg1 The first argument of the function
    @param arg2 The second argument of the function
    @return An item representing the function call
  */
  virtual Item *create(THD *thd, Item *arg1, Item *arg2) = 0;

protected:
  /** Constructor. */
  Create_func_arg2() {}
  /** Destructor. */
  virtual ~Create_func_arg2() {}
};


/**
  Adapter for functions that takes exactly three arguments.
*/

class Create_func_arg3 : public Create_func
{
public:
  virtual Item *create_func(THD *thd, LEX_STRING name, List<Item> *item_list);

  /**
    Builder method, with three arguments.
    @param thd The current thread
    @param arg1 The first argument of the function
    @param arg2 The second argument of the function
    @param arg3 The third argument of the function
    @return An item representing the function call
  */
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3) = 0;

protected:
  /** Constructor. */
  Create_func_arg3() {}
  /** Destructor. */
  virtual ~Create_func_arg3() {}
};


/**
  Function builder for Stored Functions.
*/

class Create_sp_func : public Create_qfunc
{
public:
  virtual Item *create(THD *thd, LEX_STRING db, LEX_STRING name,
                       bool use_explicit_name, List<Item> *item_list);

  static Create_sp_func s_singleton;

protected:
  /** Constructor. */
  Create_sp_func() {}
  /** Destructor. */
  virtual ~Create_sp_func() {}
};


#ifndef HAVE_SPATIAL
/**
  Common (non) builder for geometry functions.
  This builder is used in <code>--without-geometry</code> builds only,
  to report an error.
*/

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

  /** Singleton. */
  static Create_func_no_geom s_singleton;

protected:
  /** Constructor. */
  Create_func_no_geom() {}
  /** Destructor. */
  virtual ~Create_func_no_geom() {}
};
#endif


/*
  Concrete functions builders (native functions).
  Please keep this list sorted in alphabetical order,
  it helps to compare code between versions, and helps with merges conflicts.
*/

class Create_func_abs : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_abs s_singleton;

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


class Create_func_acos : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_acos s_singleton;

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


class Create_func_addtime : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_addtime s_singleton;

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


class Create_func_aes_encrypt : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_aes_encrypt s_singleton;

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


class Create_func_aes_decrypt : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_aes_decrypt s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_area : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_area s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_as_wkb : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_as_wkb s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_as_wkt : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_as_wkt s_singleton;

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


class Create_func_asin : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_asin s_singleton;

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


class Create_func_atan : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_atan s_singleton;

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


class Create_func_benchmark : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_benchmark s_singleton;

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


class Create_func_bin : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_bin s_singleton;

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


class Create_func_bit_count : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_bit_count s_singleton;

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


class Create_func_bit_length : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_bit_length s_singleton;

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


class Create_func_ceiling : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_ceiling s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_centroid : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_centroid s_singleton;

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


class Create_func_char_length : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_char_length s_singleton;

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


class Create_func_coercibility : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_coercibility s_singleton;

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


class Create_func_compress : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_compress s_singleton;

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


class Create_func_concat : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_concat s_singleton;

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


class Create_func_concat_ws : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_concat_ws s_singleton;

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


class Create_func_connection_id : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_connection_id s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_contains : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_contains s_singleton;

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


class Create_func_conv : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_conv s_singleton;

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


class Create_func_convert_tz : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_convert_tz s_singleton;

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


class Create_func_cos : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_cos s_singleton;

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


class Create_func_cot : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_cot s_singleton;

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


class Create_func_crc32 : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_crc32 s_singleton;

protected:
  Create_func_crc32() {}
  virtual ~Create_func_crc32() {}
};


#ifdef HAVE_SPATIAL
class Create_func_crosses : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_crosses s_singleton;

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


class Create_func_date_format : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_date_format s_singleton;

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


class Create_func_datediff : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_datediff s_singleton;

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


class Create_func_dayname : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_dayname s_singleton;

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


class Create_func_dayofmonth : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_dayofmonth s_singleton;

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


class Create_func_dayofweek : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_dayofweek s_singleton;

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


class Create_func_dayofyear : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_dayofyear s_singleton;

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


class Create_func_decode : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_decode s_singleton;

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


class Create_func_degrees : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_degrees s_singleton;

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


class Create_func_des_decrypt : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_des_decrypt s_singleton;

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


class Create_func_des_encrypt : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_des_encrypt s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_dimension : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_dimension s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_disjoint : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_disjoint s_singleton;

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


class Create_func_elt : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_elt s_singleton;

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


class Create_func_encode : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_encode s_singleton;

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


class Create_func_encrypt : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_encrypt s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_endpoint : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_endpoint s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_envelope : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_envelope s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_equals : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_equals s_singleton;

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


class Create_func_exp : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_exp s_singleton;

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


class Create_func_export_set : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_export_set s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_exteriorring : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_exteriorring s_singleton;

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


class Create_func_field : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_field s_singleton;

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


class Create_func_find_in_set : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_find_in_set s_singleton;

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


class Create_func_floor : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_floor s_singleton;

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


class Create_func_format : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_format s_singleton;

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


class Create_func_found_rows : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_found_rows s_singleton;

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


class Create_func_from_days : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_from_days s_singleton;

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


class Create_func_from_unixtime : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_from_unixtime s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_geometry_from_text : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_geometry_from_text s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_geometry_from_wkb : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_geometry_from_wkb s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_geometry_type : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_geometry_type s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_geometryn : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_geometryn s_singleton;

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


class Create_func_get_lock : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_get_lock s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_glength : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_glength s_singleton;

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


class Create_func_greatest : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_greatest s_singleton;

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


class Create_func_hex : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_hex s_singleton;

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


class Create_func_ifnull : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_ifnull s_singleton;

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


class Create_func_inet_ntoa : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_inet_ntoa s_singleton;

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


class Create_func_inet_aton : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_inet_aton s_singleton;

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


class Create_func_instr : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_instr s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_interiorringn : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_interiorringn s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_intersects : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_intersects s_singleton;

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


class Create_func_is_free_lock : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_is_free_lock s_singleton;

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


class Create_func_is_used_lock : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_is_used_lock s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_isclosed : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_isclosed s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_isempty : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_isempty s_singleton;

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


class Create_func_isnull : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_isnull s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_issimple : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_issimple s_singleton;

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


class Create_func_last_day : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_last_day s_singleton;

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


class Create_func_last_insert_id : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_last_insert_id s_singleton;

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


class Create_func_lcase : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_lcase s_singleton;

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


class Create_func_least : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_least s_singleton;

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


class Create_func_length : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_length s_singleton;

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


class Create_func_ln : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_ln s_singleton;

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


class Create_func_load_file : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_load_file s_singleton;

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


class Create_func_locate : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_locate s_singleton;

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


class Create_func_log : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_log s_singleton;

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


class Create_func_log10 : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_log10 s_singleton;

protected:
  Create_func_log10() {}
  virtual ~Create_func_log10() {}
};


class Create_func_log2 : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_log2 s_singleton;

protected:
  Create_func_log2() {}
  virtual ~Create_func_log2() {}
};


class Create_func_lpad : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_lpad s_singleton;

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


class Create_func_ltrim : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_ltrim s_singleton;

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


class Create_func_makedate : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_makedate s_singleton;

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


class Create_func_maketime : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_maketime s_singleton;

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


class Create_func_make_set : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_make_set s_singleton;

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


class Create_func_master_pos_wait : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_master_pos_wait s_singleton;

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


class Create_func_md5 : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_md5 s_singleton;

protected:
  Create_func_md5() {}
  virtual ~Create_func_md5() {}
};


class Create_func_monthname : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_monthname s_singleton;

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


class Create_func_name_const : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_name_const s_singleton;

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


class Create_func_nullif : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_nullif s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_numgeometries : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_numgeometries s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_numinteriorring : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_numinteriorring s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_numpoints : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_numpoints s_singleton;

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


class Create_func_oct : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_oct s_singleton;

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


class Create_func_ord : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_ord s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_overlaps : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_overlaps s_singleton;

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


class Create_func_period_add : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_period_add s_singleton;

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


class Create_func_period_diff : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_period_diff s_singleton;

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


class Create_func_pi : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_pi s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_pointn : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_pointn s_singleton;

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


class Create_func_pow : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_pow s_singleton;

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


class Create_func_quote : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_quote s_singleton;

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


class Create_func_radians : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_radians s_singleton;

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


class Create_func_rand : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_rand s_singleton;

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


class Create_func_release_lock : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_release_lock s_singleton;

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


class Create_func_reverse : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_reverse s_singleton;

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


class Create_func_round : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_round s_singleton;

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


class Create_func_row_count : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_row_count s_singleton;

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


class Create_func_rpad : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_rpad s_singleton;

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


class Create_func_rtrim : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_rtrim s_singleton;

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


class Create_func_sec_to_time : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_sec_to_time s_singleton;

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


class Create_func_sha : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_sha s_singleton;

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


class Create_func_sign : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_sign s_singleton;

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


class Create_func_sin : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_sin s_singleton;

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


class Create_func_sleep : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_sleep s_singleton;

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


class Create_func_soundex : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_soundex s_singleton;

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


class Create_func_space : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_space s_singleton;

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


class Create_func_sqrt : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_sqrt s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_srid : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_srid s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_startpoint : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_startpoint s_singleton;

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


class Create_func_str_to_date : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_str_to_date s_singleton;

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


class Create_func_strcmp : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_strcmp s_singleton;

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


class Create_func_substr_index : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_substr_index s_singleton;

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


class Create_func_subtime : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_subtime s_singleton;

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


class Create_func_tan : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_tan s_singleton;

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


class Create_func_time_format : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_time_format s_singleton;

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


class Create_func_time_to_sec : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_time_to_sec s_singleton;

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


class Create_func_timediff : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_timediff s_singleton;

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


class Create_func_to_days : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_to_days s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_touches : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_touches s_singleton;

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


class Create_func_ucase : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_ucase s_singleton;

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


class Create_func_uncompress : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_uncompress s_singleton;

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


class Create_func_uncompressed_length : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_uncompressed_length s_singleton;

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


class Create_func_unhex : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_unhex s_singleton;

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


class Create_func_unix_timestamp : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_unix_timestamp s_singleton;

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


class Create_func_uuid : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_uuid s_singleton;

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


class Create_func_uuid_short : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_uuid_short s_singleton;

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


class Create_func_version : public Create_func_arg0
{
public:
  virtual Item *create(THD *thd);

  static Create_func_version s_singleton;

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


class Create_func_weekday : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_weekday s_singleton;

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


class Create_func_weekofyear : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_weekofyear s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_within : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_within s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_x : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_x s_singleton;

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


class Create_func_xml_extractvalue : public Create_func_arg2
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2);

  static Create_func_xml_extractvalue s_singleton;

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


class Create_func_xml_update : public Create_func_arg3
{
public:
  virtual Item *create(THD *thd, Item *arg1, Item *arg2, Item *arg3);

  static Create_func_xml_update s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_y : public Create_func_arg1
{
public:
  virtual Item *create(THD *thd, Item *arg1);

  static Create_func_y s_singleton;

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


class Create_func_year_week : public Create_native_func
{
public:
  virtual Item *create_native(THD *thd, LEX_STRING name, List<Item> *item_list);

  static Create_func_year_week s_singleton;

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


/*
=============================================================================
  IMPLEMENTATION
=============================================================================
*/

/**
  Checks if there are named parameters in a parameter list.
  The syntax to name parameters in a function call is as follow:
  <code>foo(expr AS named, expr named, expr AS "named", expr "named")</code>
  @param params The parameter list, can be null
  @return true if one or more parameter is named
*/
static bool has_named_parameters(List<Item> *params)
{
  if (params)
  {
    Item *param;
    List_iterator<Item> it(*params);
    while ((param= it++))
    {
      if (! param->is_autogenerated_name)
        return true;
    }
  }

  return false;
}

#ifndef HAVE_SPATIAL
Create_func_no_geom Create_func_no_geom::s_singleton;

Item*
Create_func_no_geom::create_func(THD * /* unused */,
                            LEX_STRING /* unused */,
                            List<Item> * /* unused */)
{
  /* FIXME: error message can't be translated. */
  my_error(ER_FEATURE_DISABLED, MYF(0),
           sym_group_geom.name, sym_group_geom.needed_define);
  return NULL;
}
#endif


Item*
Create_qfunc::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  LEX_STRING db;

  if (! thd->db && ! thd->lex->sphead)
  {
    /*
      The proper error message should be in the lines of:
        Can't resolve <name>() to a function call,
        because this function:
        - is not a native function,
        - is not a user defined function,
        - can not match a qualified (read: stored) function
          since no database is selected.
      Reusing ER_SP_DOES_NOT_EXIST have a message consistent with
      the case when a default database exist, see Create_sp_func::create().
    */
    my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
             "FUNCTION", name.str);
    return NULL;
  }

  if (thd->lex->copy_db_to(&db.str, &db.length))
    return NULL;

  return create(thd, db, name, false, item_list);
}


#ifdef HAVE_DLOPEN
Create_udf_func Create_udf_func::s_singleton;

Item*
Create_udf_func::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  udf_func *udf= find_udf(name.str, name.length);
  DBUG_ASSERT(udf);
  return create(thd, udf, item_list);
}


Item*
Create_udf_func::create(THD *thd, udf_func *udf, List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

  if (item_list != NULL)
    arg_count= item_list->elements;

  thd->lex->set_stmt_unsafe();

  DBUG_ASSERT(   (udf->type == UDFTYPE_FUNCTION)
              || (udf->type == UDFTYPE_AGGREGATE));

  switch(udf->returns) {
  case STRING_RESULT:
  {
    if (udf->type == UDFTYPE_FUNCTION)
    {
      if (arg_count)
        func= new (thd->mem_root) Item_func_udf_str(udf, *item_list);
      else
        func= new (thd->mem_root) Item_func_udf_str(udf);
    }
    else
    {
      if (arg_count)
        func= new (thd->mem_root) Item_sum_udf_str(udf, *item_list);
      else
        func= new (thd->mem_root) Item_sum_udf_str(udf);
    }
    break;
  }
  case REAL_RESULT:
  {
    if (udf->type == UDFTYPE_FUNCTION)
    {
      if (arg_count)
        func= new (thd->mem_root) Item_func_udf_float(udf, *item_list);
      else
        func= new (thd->mem_root) Item_func_udf_float(udf);
    }
    else
    {
      if (arg_count)
        func= new (thd->mem_root) Item_sum_udf_float(udf, *item_list);
      else
        func= new (thd->mem_root) Item_sum_udf_float(udf);
    }
    break;
  }
  case INT_RESULT:
  {
    if (udf->type == UDFTYPE_FUNCTION)
    {
      if (arg_count)
        func= new (thd->mem_root) Item_func_udf_int(udf, *item_list);
      else
        func= new (thd->mem_root) Item_func_udf_int(udf);
    }
    else
    {
      if (arg_count)
        func= new (thd->mem_root) Item_sum_udf_int(udf, *item_list);
      else
        func= new (thd->mem_root) Item_sum_udf_int(udf);
    }
    break;
  }
  case DECIMAL_RESULT:
  {
    if (udf->type == UDFTYPE_FUNCTION)
    {
      if (arg_count)
        func= new (thd->mem_root) Item_func_udf_decimal(udf, *item_list);
      else
        func= new (thd->mem_root) Item_func_udf_decimal(udf);
    }
    else
    {
      if (arg_count)
        func= new (thd->mem_root) Item_sum_udf_decimal(udf, *item_list);
      else
        func= new (thd->mem_root) Item_sum_udf_decimal(udf);
    }
    break;
  }
  default:
  {
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "UDF return type");
  }
  }
  thd->lex->safe_to_cache_query= 0;
  return func;
}
#endif


Create_sp_func Create_sp_func::s_singleton;

Item*
Create_sp_func::create(THD *thd, LEX_STRING db, LEX_STRING name,
                       bool use_explicit_name, List<Item> *item_list)
{
  int arg_count= 0;
  Item *func= NULL;
  LEX *lex= thd->lex;
  sp_name *qname;

  if (has_named_parameters(item_list))
  {
    /*
      The syntax "db.foo(expr AS p1, expr AS p2, ...) is invalid,
      and has been rejected during syntactic parsing already,
      because a stored function call may not have named parameters.

      The syntax "foo(expr AS p1, expr AS p2, ...)" is correct,
      because it can refer to a User Defined Function call.
      For a Stored Function however, this has no semantic.
    */
    my_error(ER_WRONG_PARAMETERS_TO_STORED_FCT, MYF(0), name.str);
    return NULL;
  }

  if (item_list != NULL)
    arg_count= item_list->elements;

  qname= new (thd->mem_root) sp_name(db, name, use_explicit_name);
  qname->init_qname(thd);
  sp_add_used_routine(lex, thd, qname, TYPE_ENUM_FUNCTION);

  if (arg_count > 0)
    func= new (thd->mem_root) Item_func_sp(lex->current_context(), qname,
                                           *item_list);
  else
    func= new (thd->mem_root) Item_func_sp(lex->current_context(), qname);

  lex->safe_to_cache_query= 0;
  return func;
}


Item*
Create_native_func::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  if (has_named_parameters(item_list))
  {
    my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return create_native(thd, name, item_list);
}


Item*
Create_func_arg0::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  int arg_count= 0;

  if (item_list != NULL)
    arg_count= item_list->elements;

  if (arg_count != 0)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0)