/*
   Copyright (c) 2000, 2011, Oracle and/or its affiliates.
   Copyright (c) 2008-2011 Monty Program Ab

   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 "sql_priv.h"
/*
  It is necessary to include set_var.h instead of item.h because there
  are dependencies on include order for set_var.h and item.h. This
  will be resolved later.
*/
#include "sql_class.h"                          // set_var.h: THD
#include "set_var.h"
#include "sp_head.h"
#include "sp.h"

/*
=============================================================================
  HELPER FUNCTIONS
=============================================================================
*/

static const char* item_name(Item *a, String *str)
{
  if (a->name)
    return a->name;
  str->length(0);
  a->print(str, QT_ORDINARY);
  return str->c_ptr_safe();
}


static void wrong_precision_error(uint errcode, Item *a,
                                  ulonglong number, ulong maximum)
{
  char buff[1024];
  String buf(buff, sizeof(buff), system_charset_info);

  my_error(errcode, MYF(0), (uint) MY_MIN(number, UINT_MAX32),
           item_name(a, &buf), maximum);
}


/**
  Get precision and scale for a declaration
 
  return
    0  ok
    1  error
*/

bool get_length_and_scale(ulonglong length, ulonglong decimals,
                          ulong *out_length, uint *out_decimals,
                          uint max_precision, uint max_scale,
                          Item *a)
{
  if (length > (ulonglong) max_precision)
  {
    wrong_precision_error(ER_TOO_BIG_PRECISION, a, length, max_precision);
    return 1;
  }
  if (decimals > (ulonglong) max_scale)
  {
    wrong_precision_error(ER_TOO_BIG_SCALE, a, decimals, max_scale);
    return 1;
  }

  *out_length=  (ulong) length;
  *out_decimals=  (uint) decimals;
  my_decimal_trim(out_length, out_decimals);
  
  if (*out_length < *out_decimals)
  {
    my_error(ER_M_BIGGER_THAN_D, MYF(0), "");
    return 1;
  }
  return 0;
}

/*
=============================================================================
  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_builder(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_1_arg(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_2_arg(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_3_arg(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_with_db(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_1_arg(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_1_arg(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_2_arg(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_2_arg(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_2_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_2_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_coercibility s_singleton;

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

class Create_func_dyncol_check : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(THD *thd, Item *arg1);

  static Create_func_dyncol_check s_singleton;

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

class Create_func_dyncol_exists : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_dyncol_exists s_singleton;

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

class Create_func_dyncol_list : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(THD *thd, Item *arg1);

  static Create_func_dyncol_list s_singleton;

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

class Create_func_dyncol_json : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(THD *thd, Item *arg1);

  static Create_func_dyncol_json s_singleton;

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


class Create_func_compress : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(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_builder(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_mbr_contains : public Create_func_arg2
{
  public:
    virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_mbr_contains s_singleton;

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


class Create_func_contains : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(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_3_arg(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_3_arg(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_1_arg(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_1_arg(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_1_arg(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_2_arg(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_2_arg(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_2_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_2_arg(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_1_arg(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_1_arg(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_mbr_disjoint : public Create_func_arg2
{
  public:
    virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_mbr_disjoint s_singleton;

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


class Create_func_disjoint : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_disjoint s_singleton;

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


class Create_func_distance : public Create_func_arg2
{
  public:
    virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_distance s_singleton;

  protected:
    Create_func_distance() {}
    virtual ~Create_func_distance() {}
};
#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_2_arg(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_1_arg(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_1_arg(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_mbr_equals : public Create_func_arg2
{
  public:
    virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_mbr_equals s_singleton;

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


class Create_func_equals : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(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_1_arg(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_1_arg(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_2_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_floor s_singleton;

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


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

  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_builder(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_1_arg(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_1_arg(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_2_arg(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_2_arg(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_1_arg(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_1_arg(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_2_arg(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_1_arg(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_1_arg(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_2_arg(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_2_arg(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_mbr_intersects : public Create_func_arg2
{
  public:
    virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_mbr_intersects s_singleton;

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


class Create_func_intersects : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_intersects s_singleton;

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


class Create_func_intersection : public Create_func_arg2
{
public:
  virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_intersection s_singleton;

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


class Create_func_difference : public Create_func_arg2
{
public:
  virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_difference s_singleton;

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


class Create_func_union : public Create_func_arg2
{
public:
  virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_union s_singleton;

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


class Create_func_symdifference : public Create_func_arg2
{
public:
  virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_symdifference s_singleton;

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


class Create_func_buffer : public Create_func_arg2
{
public:
  virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_buffer s_singleton;

protected:
  Create_func_buffer() {}
  virtual ~Create_func_buffer() {}
};
#endif /*HAVE_SPATIAL*/


class Create_func_is_free_lock : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_length s_singleton;

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


#ifndef DBUG_OFF
class Create_func_like_range_min : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_like_range_min s_singleton;

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


class Create_func_like_range_max : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_like_range_max s_singleton;

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


class Create_func_ln : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(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_1_arg(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_1_arg(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_1_arg(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_3_arg(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_1_arg(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_2_arg(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_3_arg(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_1_arg(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_1_arg(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_2_arg(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_2_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_ord s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_mbr_overlaps : public Create_func_arg2
{
  public:
    virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_mbr_overlaps s_singleton;

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


class Create_func_overlaps : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(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_2_arg(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_2_arg(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_builder(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_2_arg(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_2_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_rpad : public Create_func_arg3
{
public:
  virtual Item *create_3_arg(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_1_arg(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_1_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_sha s_singleton;

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


class Create_func_sha2 : public Create_func_arg2
{
public:
  virtual Item* create_2_arg(THD *thd, Item *arg1, Item *arg2);

  static Create_func_sha2 s_singleton;

protected:
  Create_func_sha2() {}
  virtual ~Create_func_sha2() {}
};


class Create_func_sign : public Create_func_arg1
{
public:
  virtual Item *create_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_2_arg(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_2_arg(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_3_arg(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_2_arg(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_1_arg(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_2_arg(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_1_arg(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_2_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_to_days s_singleton;

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

class Create_func_to_seconds : public Create_func_arg1
{
public:
  virtual Item* create_1_arg(THD *thd, Item *arg1);

  static Create_func_to_seconds s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_touches : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(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_1_arg(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_1_arg(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_1_arg(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_1_arg(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_builder(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_builder(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_builder(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_1_arg(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_1_arg(THD *thd, Item *arg1);

  static Create_func_weekofyear s_singleton;

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


#ifdef HAVE_SPATIAL
class Create_func_mbr_within : public Create_func_arg2
{
  public:
    virtual Item *create_2_arg(THD *thd, Item *arg1, Item *arg2);

    static Create_func_mbr_within s_singleton;

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


class Create_func_within : public Create_func_arg2
{
public:
  virtual Item *create_2_arg(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_1_arg(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_2_arg(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_3_arg(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_1_arg(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_with_db(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;

  DBUG_ENTER("Create_udf_func::create");
  if (item_list != NULL)
    arg_count= item_list->elements;

  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_UDF);

  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;
  DBUG_RETURN(func);
}
#endif


Create_sp_func Create_sp_func::s_singleton;

Item*
Create_sp_func::create_with_db(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), name.str);
    return NULL;
  }

  return create_builder(thd);
}


Item*
Create_func_arg1::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  int arg_count= 0;

  if (item_list)
    arg_count= item_list->elements;

  if (arg_count != 1)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  Item *param_1= item_list->pop();

  if (! param_1->is_autogenerated_name)
  {
    my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return create_1_arg(thd, param_1);
}


Item*
Create_func_arg2::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  int arg_count= 0;

  if (item_list)
    arg_count= item_list->elements;

  if (arg_count != 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  Item *param_1= item_list->pop();
  Item *param_2= item_list->pop();

  if (   (! param_1->is_autogenerated_name)
      || (! param_2->is_autogenerated_name))
  {
    my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return create_2_arg(thd, param_1, param_2);
}


Item*
Create_func_arg3::create_func(THD *thd, LEX_STRING name, List<Item> *item_list)
{
  int arg_count= 0;

  if (item_list)
    arg_count= item_list->elements;

  if (arg_count != 3)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  Item *param_1= item_list->pop();
  Item *param_2= item_list->pop();
  Item *param_3= item_list->pop();

  if (   (! param_1->is_autogenerated_name)
      || (! param_2->is_autogenerated_name)
      || (! param_3->is_autogenerated_name))
  {
    my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return create_3_arg(thd, param_1, param_2, param_3);
}


Create_func_abs Create_func_abs::s_singleton;

Item*
Create_func_abs::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_abs(arg1);
}


Create_func_acos Create_func_acos::s_singleton;

Item*
Create_func_acos::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_acos(arg1);
}


Create_func_addtime Create_func_addtime::s_singleton;

Item*
Create_func_addtime::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_add_time(arg1, arg2, 0, 0);
}


Create_func_aes_encrypt Create_func_aes_encrypt::s_singleton;

Item*
Create_func_aes_encrypt::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_aes_encrypt(arg1, arg2);
}


Create_func_aes_decrypt Create_func_aes_decrypt::s_singleton;

Item*
Create_func_aes_decrypt::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_aes_decrypt(arg1, arg2);
}


#ifdef HAVE_SPATIAL
Create_func_area Create_func_area::s_singleton;

Item*
Create_func_area::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_area(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_as_wkb Create_func_as_wkb::s_singleton;

Item*
Create_func_as_wkb::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_as_wkb(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_as_wkt Create_func_as_wkt::s_singleton;

Item*
Create_func_as_wkt::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_as_wkt(arg1);
}
#endif


Create_func_asin Create_func_asin::s_singleton;

Item*
Create_func_asin::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_asin(arg1);
}


Create_func_atan Create_func_atan::s_singleton;

Item*
Create_func_atan::create_native(THD *thd, LEX_STRING name,
                                List<Item> *item_list)
{
  Item* func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_atan(param_1);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_atan(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_benchmark Create_func_benchmark::s_singleton;

Item*
Create_func_benchmark::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return new (thd->mem_root) Item_func_benchmark(arg1, arg2);
}


Create_func_bin Create_func_bin::s_singleton;

Item*
Create_func_bin::create_1_arg(THD *thd, Item *arg1)
{
  Item *i10= new (thd->mem_root) Item_int((int32) 10,2);
  Item *i2= new (thd->mem_root) Item_int((int32) 2,1);
  return new (thd->mem_root) Item_func_conv(arg1, i10, i2);
}


Create_func_bit_count Create_func_bit_count::s_singleton;

Item*
Create_func_bit_count::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_bit_count(arg1);
}


Create_func_bit_length Create_func_bit_length::s_singleton;

Item*
Create_func_bit_length::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_bit_length(arg1);
}


Create_func_ceiling Create_func_ceiling::s_singleton;

Item*
Create_func_ceiling::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_ceiling(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_centroid Create_func_centroid::s_singleton;

Item*
Create_func_centroid::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_centroid(arg1);
}
#endif


Create_func_char_length Create_func_char_length::s_singleton;

Item*
Create_func_char_length::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_char_length(arg1);
}


Create_func_coercibility Create_func_coercibility::s_singleton;

Item*
Create_func_coercibility::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_coercibility(arg1);
}


Create_func_dyncol_check Create_func_dyncol_check::s_singleton;

Item*
Create_func_dyncol_check::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dyncol_check(arg1);
}

Create_func_dyncol_exists Create_func_dyncol_exists::s_singleton;

Item*
Create_func_dyncol_exists::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_dyncol_exists(arg1, arg2);
}

Create_func_dyncol_list Create_func_dyncol_list::s_singleton;

Item*
Create_func_dyncol_list::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dyncol_list(arg1);
}

Create_func_dyncol_json Create_func_dyncol_json::s_singleton;

Item*
Create_func_dyncol_json::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dyncol_json(arg1);
}

Create_func_concat Create_func_concat::s_singleton;

Item*
Create_func_concat::create_native(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 < 1)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return new (thd->mem_root) Item_func_concat(*item_list);
}


Create_func_concat_ws Create_func_concat_ws::s_singleton;

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

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

  /* "WS" stands for "With Separator": this function takes 2+ arguments */
  if (arg_count < 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return new (thd->mem_root) Item_func_concat_ws(*item_list);
}


Create_func_compress Create_func_compress::s_singleton;

Item*
Create_func_compress::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_compress(arg1);
}


Create_func_connection_id Create_func_connection_id::s_singleton;

Item*
Create_func_connection_id::create_builder(THD *thd)
{
  thd->lex->safe_to_cache_query= 0;
  return new (thd->mem_root) Item_func_connection_id();
}


#ifdef HAVE_SPATIAL
Create_func_mbr_contains Create_func_mbr_contains::s_singleton;

Item*
Create_func_mbr_contains::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_mbr_rel(arg1, arg2,
      Item_func::SP_CONTAINS_FUNC);
}


Create_func_contains Create_func_contains::s_singleton;

Item*
Create_func_contains::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_CONTAINS_FUNC);
}
#endif


Create_func_conv Create_func_conv::s_singleton;

Item*
Create_func_conv::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_conv(arg1, arg2, arg3);
}


Create_func_convert_tz Create_func_convert_tz::s_singleton;

Item*
Create_func_convert_tz::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_convert_tz(arg1, arg2, arg3);
}


Create_func_cos Create_func_cos::s_singleton;

Item*
Create_func_cos::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_cos(arg1);
}


Create_func_cot Create_func_cot::s_singleton;

Item*
Create_func_cot::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_cot(arg1);
}


Create_func_crc32 Create_func_crc32::s_singleton;

Item*
Create_func_crc32::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_crc32(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_crosses Create_func_crosses::s_singleton;

Item*
Create_func_crosses::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_CROSSES_FUNC);
}
#endif


Create_func_date_format Create_func_date_format::s_singleton;

Item*
Create_func_date_format::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_date_format(arg1, arg2, 0);
}


Create_func_datediff Create_func_datediff::s_singleton;

Item*
Create_func_datediff::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  Item *i1= new (thd->mem_root) Item_func_to_days(arg1);
  Item *i2= new (thd->mem_root) Item_func_to_days(arg2);

  return new (thd->mem_root) Item_func_minus(i1, i2);
}


Create_func_dayname Create_func_dayname::s_singleton;

Item*
Create_func_dayname::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dayname(arg1);
}


Create_func_dayofmonth Create_func_dayofmonth::s_singleton;

Item*
Create_func_dayofmonth::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dayofmonth(arg1);
}


Create_func_dayofweek Create_func_dayofweek::s_singleton;

Item*
Create_func_dayofweek::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_weekday(arg1, 1);
}


Create_func_dayofyear Create_func_dayofyear::s_singleton;

Item*
Create_func_dayofyear::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dayofyear(arg1);
}


Create_func_decode Create_func_decode::s_singleton;

Item*
Create_func_decode::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_decode(arg1, arg2);
}


Create_func_degrees Create_func_degrees::s_singleton;

Item*
Create_func_degrees::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_units((char*) "degrees", arg1,
                                             180/M_PI, 0.0);
}


Create_func_des_decrypt Create_func_des_decrypt::s_singleton;

Item*
Create_func_des_decrypt::create_native(THD *thd, LEX_STRING name,
                                       List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_des_decrypt(param_1);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_des_decrypt(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_des_encrypt Create_func_des_encrypt::s_singleton;

Item*
Create_func_des_encrypt::create_native(THD *thd, LEX_STRING name,
                                       List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_des_encrypt(param_1);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_des_encrypt(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


#ifdef HAVE_SPATIAL
Create_func_dimension Create_func_dimension::s_singleton;

Item*
Create_func_dimension::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_dimension(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_mbr_disjoint Create_func_mbr_disjoint::s_singleton;

Item*
Create_func_mbr_disjoint::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_mbr_rel(arg1, arg2,
      Item_func::SP_DISJOINT_FUNC);
}


Create_func_disjoint Create_func_disjoint::s_singleton;

Item*
Create_func_disjoint::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_DISJOINT_FUNC);
}


Create_func_distance Create_func_distance::s_singleton;

Item*
Create_func_distance::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_distance(arg1, arg2);
}
#endif


Create_func_elt Create_func_elt::s_singleton;

Item*
Create_func_elt::create_native(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 < 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return new (thd->mem_root) Item_func_elt(*item_list);
}


Create_func_encode Create_func_encode::s_singleton;

Item*
Create_func_encode::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_encode(arg1, arg2);
}


Create_func_encrypt Create_func_encrypt::s_singleton;

Item*
Create_func_encrypt::create_native(THD *thd, LEX_STRING name,
                                   List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_encrypt(param_1);
    thd->lex->uncacheable(UNCACHEABLE_RAND);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_encrypt(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


#ifdef HAVE_SPATIAL
Create_func_endpoint Create_func_endpoint::s_singleton;

Item*
Create_func_endpoint::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_spatial_decomp(arg1,
                                                      Item_func::SP_ENDPOINT);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_envelope Create_func_envelope::s_singleton;

Item*
Create_func_envelope::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_envelope(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_mbr_equals Create_func_mbr_equals::s_singleton;

Item*
Create_func_mbr_equals::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_mbr_rel(arg1, arg2,
      Item_func::SP_EQUALS_FUNC);
}


Create_func_equals Create_func_equals::s_singleton;

Item*
Create_func_equals::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_EQUALS_FUNC);
}
#endif


Create_func_exp Create_func_exp::s_singleton;

Item*
Create_func_exp::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_exp(arg1);
}


Create_func_export_set Create_func_export_set::s_singleton;

Item*
Create_func_export_set::create_native(THD *thd, LEX_STRING name,
                                      List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 3:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    Item *param_3= item_list->pop();
    func= new (thd->mem_root) Item_func_export_set(param_1, param_2, param_3);
    break;
  }
  case 4:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    Item *param_3= item_list->pop();
    Item *param_4= item_list->pop();
    func= new (thd->mem_root) Item_func_export_set(param_1, param_2, param_3,
                                                   param_4);
    break;
  }
  case 5:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    Item *param_3= item_list->pop();
    Item *param_4= item_list->pop();
    Item *param_5= item_list->pop();
    func= new (thd->mem_root) Item_func_export_set(param_1, param_2, param_3,
                                                   param_4, param_5);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


#ifdef HAVE_SPATIAL
Create_func_exteriorring Create_func_exteriorring::s_singleton;

Item*
Create_func_exteriorring::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_spatial_decomp(arg1,
                                                      Item_func::SP_EXTERIORRING);
}
#endif


Create_func_field Create_func_field::s_singleton;

Item*
Create_func_field::create_native(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 < 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return new (thd->mem_root) Item_func_field(*item_list);
}


Create_func_find_in_set Create_func_find_in_set::s_singleton;

Item*
Create_func_find_in_set::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_find_in_set(arg1, arg2);
}


Create_func_floor Create_func_floor::s_singleton;

Item*
Create_func_floor::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_floor(arg1);
}


Create_func_format Create_func_format::s_singleton;

Item*
Create_func_format::create_native(THD *thd, LEX_STRING name,
                                  List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= item_list ? item_list->elements : 0;

  switch (arg_count) {
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_format(param_1, param_2);
    break;
  }
  case 3:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    Item *param_3= item_list->pop();
    func= new (thd->mem_root) Item_func_format(param_1, param_2, param_3);
    break;
  }
  default:
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }

  return func;
}


Create_func_found_rows Create_func_found_rows::s_singleton;

Item*
Create_func_found_rows::create_builder(THD *thd)
{
  DBUG_ENTER("Create_func_found_rows::create");
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->safe_to_cache_query= 0;
  DBUG_RETURN(new (thd->mem_root) Item_func_found_rows());
}


Create_func_from_days Create_func_from_days::s_singleton;

Item*
Create_func_from_days::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_from_days(arg1);
}


Create_func_from_unixtime Create_func_from_unixtime::s_singleton;

Item*
Create_func_from_unixtime::create_native(THD *thd, LEX_STRING name,
                                         List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_from_unixtime(param_1);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    Item *ut= new (thd->mem_root) Item_func_from_unixtime(param_1);
    func= new (thd->mem_root) Item_func_date_format(ut, param_2, 0);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


#ifdef HAVE_SPATIAL
Create_func_geometry_from_text Create_func_geometry_from_text::s_singleton;

Item*
Create_func_geometry_from_text::create_native(THD *thd, LEX_STRING name,
                                              List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_geometry_from_text(param_1);
    thd->lex->uncacheable(UNCACHEABLE_RAND);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_geometry_from_text(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}
#endif


#ifdef HAVE_SPATIAL
Create_func_geometry_from_wkb Create_func_geometry_from_wkb::s_singleton;

Item*
Create_func_geometry_from_wkb::create_native(THD *thd, LEX_STRING name,
                                             List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_geometry_from_wkb(param_1);
    thd->lex->uncacheable(UNCACHEABLE_RAND);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_geometry_from_wkb(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}
#endif


#ifdef HAVE_SPATIAL
Create_func_geometry_type Create_func_geometry_type::s_singleton;

Item*
Create_func_geometry_type::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_geometry_type(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_geometryn Create_func_geometryn::s_singleton;

Item*
Create_func_geometryn::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_decomp_n(arg1, arg2,
                                                        Item_func::SP_GEOMETRYN);
}
#endif


Create_func_get_lock Create_func_get_lock::s_singleton;

Item*
Create_func_get_lock::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return new (thd->mem_root) Item_func_get_lock(arg1, arg2);
}


#ifdef HAVE_SPATIAL
Create_func_glength Create_func_glength::s_singleton;

Item*
Create_func_glength::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_glength(arg1);
}
#endif


Create_func_greatest Create_func_greatest::s_singleton;

Item*
Create_func_greatest::create_native(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 < 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return new (thd->mem_root) Item_func_max(*item_list);
}


Create_func_hex Create_func_hex::s_singleton;

Item*
Create_func_hex::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_hex(arg1);
}


Create_func_ifnull Create_func_ifnull::s_singleton;

Item*
Create_func_ifnull::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_ifnull(arg1, arg2);
}


Create_func_inet_ntoa Create_func_inet_ntoa::s_singleton;

Item*
Create_func_inet_ntoa::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_inet_ntoa(arg1);
}


Create_func_inet_aton Create_func_inet_aton::s_singleton;

Item*
Create_func_inet_aton::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_inet_aton(arg1);
}


Create_func_instr Create_func_instr::s_singleton;

Item*
Create_func_instr::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_locate(arg1, arg2);
}


#ifdef HAVE_SPATIAL
Create_func_interiorringn Create_func_interiorringn::s_singleton;

Item*
Create_func_interiorringn::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_decomp_n(arg1, arg2,
                                                        Item_func::SP_INTERIORRINGN);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_mbr_intersects Create_func_mbr_intersects::s_singleton;

Item*
Create_func_mbr_intersects::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_mbr_rel(arg1, arg2,
      Item_func::SP_INTERSECTS_FUNC);
}


Create_func_intersects Create_func_intersects::s_singleton;

Item*
Create_func_intersects::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_INTERSECTS_FUNC);
}


Create_func_intersection Create_func_intersection::s_singleton;

Item*
Create_func_intersection::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_operation(arg1, arg2,
                               Gcalc_function::op_intersection);
}


Create_func_difference Create_func_difference::s_singleton;

Item*
Create_func_difference::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_operation(arg1, arg2,
                               Gcalc_function::op_difference);
}


Create_func_union Create_func_union::s_singleton;

Item*
Create_func_union::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_operation(arg1, arg2,
                               Gcalc_function::op_union);
}


Create_func_symdifference Create_func_symdifference::s_singleton;

Item*
Create_func_symdifference::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_operation(arg1, arg2,
                               Gcalc_function::op_symdifference);
}


Create_func_buffer Create_func_buffer::s_singleton;

Item*
Create_func_buffer::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_buffer(arg1, arg2);
}
#endif /*HAVE_SPATAI*/


Create_func_is_free_lock Create_func_is_free_lock::s_singleton;

Item*
Create_func_is_free_lock::create_1_arg(THD *thd, Item *arg1)
{
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return new (thd->mem_root) Item_func_is_free_lock(arg1);
}


Create_func_is_used_lock Create_func_is_used_lock::s_singleton;

Item*
Create_func_is_used_lock::create_1_arg(THD *thd, Item *arg1)
{
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return new (thd->mem_root) Item_func_is_used_lock(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_isclosed Create_func_isclosed::s_singleton;

Item*
Create_func_isclosed::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_isclosed(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_isempty Create_func_isempty::s_singleton;

Item*
Create_func_isempty::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_isempty(arg1);
}
#endif


Create_func_isnull Create_func_isnull::s_singleton;

Item*
Create_func_isnull::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_isnull(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_issimple Create_func_issimple::s_singleton;

Item*
Create_func_issimple::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_issimple(arg1);
}
#endif


Create_func_last_day Create_func_last_day::s_singleton;

Item*
Create_func_last_day::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_last_day(arg1);
}


Create_func_last_insert_id Create_func_last_insert_id::s_singleton;

Item*
Create_func_last_insert_id::create_native(THD *thd, LEX_STRING name,
                                          List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 0:
  {
    func= new (thd->mem_root) Item_func_last_insert_id();
    thd->lex->safe_to_cache_query= 0;
    break;
  }
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_last_insert_id(param_1);
    thd->lex->safe_to_cache_query= 0;
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_lcase Create_func_lcase::s_singleton;

Item*
Create_func_lcase::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_lcase(arg1);
}


Create_func_least Create_func_least::s_singleton;

Item*
Create_func_least::create_native(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 < 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  return new (thd->mem_root) Item_func_min(*item_list);
}


Create_func_length Create_func_length::s_singleton;

Item*
Create_func_length::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_length(arg1);
}


#ifndef DBUG_OFF
Create_func_like_range_min Create_func_like_range_min::s_singleton;

Item*
Create_func_like_range_min::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_like_range_min(arg1, arg2);
}


Create_func_like_range_max Create_func_like_range_max::s_singleton;

Item*
Create_func_like_range_max::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_like_range_max(arg1, arg2);
}
#endif


Create_func_ln Create_func_ln::s_singleton;

Item*
Create_func_ln::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_ln(arg1);
}


Create_func_load_file Create_func_load_file::s_singleton;

Item*
Create_func_load_file::create_1_arg(THD *thd, Item *arg1)
{
  DBUG_ENTER("Create_func_load_file::create");
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  DBUG_RETURN(new (thd->mem_root) Item_load_file(arg1));
}


Create_func_locate Create_func_locate::s_singleton;

Item*
Create_func_locate::create_native(THD *thd, LEX_STRING name,
                                  List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    /* Yes, parameters in that order : 2, 1 */
    func= new (thd->mem_root) Item_func_locate(param_2, param_1);
    break;
  }
  case 3:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    Item *param_3= item_list->pop();
    /* Yes, parameters in that order : 2, 1, 3 */
    func= new (thd->mem_root) Item_func_locate(param_2, param_1, param_3);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_log Create_func_log::s_singleton;

Item*
Create_func_log::create_native(THD *thd, LEX_STRING name,
                               List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_log(param_1);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_log(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_log10 Create_func_log10::s_singleton;

Item*
Create_func_log10::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_log10(arg1);
}


Create_func_log2 Create_func_log2::s_singleton;

Item*
Create_func_log2::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_log2(arg1);
}


Create_func_lpad Create_func_lpad::s_singleton;

Item*
Create_func_lpad::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_lpad(arg1, arg2, arg3);
}


Create_func_ltrim Create_func_ltrim::s_singleton;

Item*
Create_func_ltrim::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_ltrim(arg1);
}


Create_func_makedate Create_func_makedate::s_singleton;

Item*
Create_func_makedate::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_makedate(arg1, arg2);
}


Create_func_maketime Create_func_maketime::s_singleton;

Item*
Create_func_maketime::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_maketime(arg1, arg2, arg3);
}


Create_func_make_set Create_func_make_set::s_singleton;

Item*
Create_func_make_set::create_native(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 < 2)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return NULL;
  }

  Item *param_1= item_list->pop();
  return new (thd->mem_root) Item_func_make_set(param_1, *item_list);
}


Create_func_master_pos_wait Create_func_master_pos_wait::s_singleton;

Item*
Create_func_master_pos_wait::create_native(THD *thd, LEX_STRING name,
                                           List<Item> *item_list)

{
  Item *func= NULL;
  int arg_count= 0;

  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);

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

  if (arg_count < 2 || arg_count > 4)
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    return func;
  }

  thd->lex->safe_to_cache_query= 0;

  Item *param_1= item_list->pop();
  Item *param_2= item_list->pop();
  switch (arg_count) {
  case 2:
  {
    func= new (thd->mem_root) Item_master_pos_wait(param_1, param_2);
    break;
  }
  case 3:
  {
    Item *param_3= item_list->pop();
    func= new (thd->mem_root) Item_master_pos_wait(param_1, param_2, param_3);
    break;
  }
  case 4:
  {
    Item *param_3= item_list->pop();
    Item *param_4= item_list->pop();
    func= new (thd->mem_root) Item_master_pos_wait(param_1, param_2, param_3,
                                                   param_4);
    break;
  }
  }

  return func;
}


Create_func_md5 Create_func_md5::s_singleton;

Item*
Create_func_md5::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_md5(arg1);
}


Create_func_monthname Create_func_monthname::s_singleton;

Item*
Create_func_monthname::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_monthname(arg1);
}


Create_func_name_const Create_func_name_const::s_singleton;

Item*
Create_func_name_const::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_name_const(arg1, arg2);
}


Create_func_nullif Create_func_nullif::s_singleton;

Item*
Create_func_nullif::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_nullif(arg1, arg2);
}


#ifdef HAVE_SPATIAL
Create_func_numgeometries Create_func_numgeometries::s_singleton;

Item*
Create_func_numgeometries::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_numgeometries(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_numinteriorring Create_func_numinteriorring::s_singleton;

Item*
Create_func_numinteriorring::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_numinteriorring(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_numpoints Create_func_numpoints::s_singleton;

Item*
Create_func_numpoints::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_numpoints(arg1);
}
#endif


Create_func_oct Create_func_oct::s_singleton;

Item*
Create_func_oct::create_1_arg(THD *thd, Item *arg1)
{
  Item *i10= new (thd->mem_root) Item_int((int32) 10,2);
  Item *i8= new (thd->mem_root) Item_int((int32) 8,1);
  return new (thd->mem_root) Item_func_conv(arg1, i10, i8);
}


Create_func_ord Create_func_ord::s_singleton;

Item*
Create_func_ord::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_ord(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_mbr_overlaps Create_func_mbr_overlaps::s_singleton;

Item*
Create_func_mbr_overlaps::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_mbr_rel(arg1, arg2,
      Item_func::SP_OVERLAPS_FUNC);
}


Create_func_overlaps Create_func_overlaps::s_singleton;

Item*
Create_func_overlaps::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_OVERLAPS_FUNC);
}
#endif


Create_func_period_add Create_func_period_add::s_singleton;

Item*
Create_func_period_add::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_period_add(arg1, arg2);
}


Create_func_period_diff Create_func_period_diff::s_singleton;

Item*
Create_func_period_diff::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_period_diff(arg1, arg2);
}


Create_func_pi Create_func_pi::s_singleton;

Item*
Create_func_pi::create_builder(THD *thd)
{
  return new (thd->mem_root) Item_static_float_func("pi()", M_PI, 6, 8);
}


#ifdef HAVE_SPATIAL
Create_func_pointn Create_func_pointn::s_singleton;

Item*
Create_func_pointn::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_decomp_n(arg1, arg2,
                                                        Item_func::SP_POINTN);
}
#endif


Create_func_pow Create_func_pow::s_singleton;

Item*
Create_func_pow::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_pow(arg1, arg2);
}


Create_func_quote Create_func_quote::s_singleton;

Item*
Create_func_quote::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_quote(arg1);
}


Create_func_radians Create_func_radians::s_singleton;

Item*
Create_func_radians::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_units((char*) "radians", arg1,
                                             M_PI/180, 0.0);
}


Create_func_rand Create_func_rand::s_singleton;

Item*
Create_func_rand::create_native(THD *thd, LEX_STRING name,
                                List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  /*
    When RAND() is binlogged, the seed is binlogged too.  So the
    sequence of random numbers is the same on a replication slave as
    on the master.  However, if several RAND() values are inserted
    into a table, the order in which the rows are modified may differ
    between master and slave, because the order is undefined.  Hence,
    the statement is unsafe to log in statement format.

    For normal INSERT's this is howevever safe
  */
  if (thd->lex->sql_command != SQLCOM_INSERT)
    thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);

  switch (arg_count) {
  case 0:
  {
    func= new (thd->mem_root) Item_func_rand();
    thd->lex->uncacheable(UNCACHEABLE_RAND);
    break;
  }
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_rand(param_1);
    thd->lex->uncacheable(UNCACHEABLE_RAND);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_release_lock Create_func_release_lock::s_singleton;

Item*
Create_func_release_lock::create_1_arg(THD *thd, Item *arg1)
{
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return new (thd->mem_root) Item_func_release_lock(arg1);
}


Create_func_reverse Create_func_reverse::s_singleton;

Item*
Create_func_reverse::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_reverse(arg1);
}


Create_func_round Create_func_round::s_singleton;

Item*
Create_func_round::create_native(THD *thd, LEX_STRING name,
                                 List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    Item *i0 = new (thd->mem_root) Item_int((char*)"0", 0, 1);
    func= new (thd->mem_root) Item_func_round(param_1, i0, 0);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_round(param_1, param_2, 0);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_rpad Create_func_rpad::s_singleton;

Item*
Create_func_rpad::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_rpad(arg1, arg2, arg3);
}


Create_func_rtrim Create_func_rtrim::s_singleton;

Item*
Create_func_rtrim::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_rtrim(arg1);
}


Create_func_sec_to_time Create_func_sec_to_time::s_singleton;

Item*
Create_func_sec_to_time::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_sec_to_time(arg1);
}


Create_func_sha Create_func_sha::s_singleton;

Item*
Create_func_sha::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_sha(arg1);
}


Create_func_sha2 Create_func_sha2::s_singleton;

Item*
Create_func_sha2::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_sha2(arg1, arg2);
}


Create_func_sign Create_func_sign::s_singleton;

Item*
Create_func_sign::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_sign(arg1);
}


Create_func_sin Create_func_sin::s_singleton;

Item*
Create_func_sin::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_sin(arg1);
}


Create_func_sleep Create_func_sleep::s_singleton;

Item*
Create_func_sleep::create_1_arg(THD *thd, Item *arg1)
{
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
  return new (thd->mem_root) Item_func_sleep(arg1);
}


Create_func_soundex Create_func_soundex::s_singleton;

Item*
Create_func_soundex::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_soundex(arg1);
}


Create_func_space Create_func_space::s_singleton;

Item*
Create_func_space::create_1_arg(THD *thd, Item *arg1)
{
  /**
    TODO: Fix Bug#23637
    The parsed item tree should not depend on
    <code>thd->variables.collation_connection</code>.
  */
  CHARSET_INFO *cs= thd->variables.collation_connection;
  Item *sp;

  if (cs->mbminlen > 1)
  {
    uint dummy_errors;
    sp= new (thd->mem_root) Item_string("", 0, cs, DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII);
    sp->str_value.copy(" ", 1, &my_charset_latin1, cs, &dummy_errors);
  }
  else
  {
    sp= new (thd->mem_root) Item_string(" ", 1, cs, DERIVATION_COERCIBLE, MY_REPERTOIRE_ASCII);
  }

  return new (thd->mem_root) Item_func_repeat(sp, arg1);
}


Create_func_sqrt Create_func_sqrt::s_singleton;

Item*
Create_func_sqrt::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_sqrt(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_srid Create_func_srid::s_singleton;

Item*
Create_func_srid::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_srid(arg1);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_startpoint Create_func_startpoint::s_singleton;

Item*
Create_func_startpoint::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_spatial_decomp(arg1,
                                                      Item_func::SP_STARTPOINT);
}
#endif


Create_func_str_to_date Create_func_str_to_date::s_singleton;

Item*
Create_func_str_to_date::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_str_to_date(arg1, arg2);
}


Create_func_strcmp Create_func_strcmp::s_singleton;

Item*
Create_func_strcmp::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_strcmp(arg1, arg2);
}


Create_func_substr_index Create_func_substr_index::s_singleton;

Item*
Create_func_substr_index::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_substr_index(arg1, arg2, arg3);
}


Create_func_subtime Create_func_subtime::s_singleton;

Item*
Create_func_subtime::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_add_time(arg1, arg2, 0, 1);
}


Create_func_tan Create_func_tan::s_singleton;

Item*
Create_func_tan::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_tan(arg1);
}


Create_func_time_format Create_func_time_format::s_singleton;

Item*
Create_func_time_format::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_date_format(arg1, arg2, 1);
}


Create_func_time_to_sec Create_func_time_to_sec::s_singleton;

Item*
Create_func_time_to_sec::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_time_to_sec(arg1);
}


Create_func_timediff Create_func_timediff::s_singleton;

Item*
Create_func_timediff::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_timediff(arg1, arg2);
}


Create_func_to_days Create_func_to_days::s_singleton;

Item*
Create_func_to_days::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_to_days(arg1);
}


Create_func_to_seconds Create_func_to_seconds::s_singleton;

Item*
Create_func_to_seconds::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_to_seconds(arg1);
}


#ifdef HAVE_SPATIAL
Create_func_touches Create_func_touches::s_singleton;

Item*
Create_func_touches::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_TOUCHES_FUNC);
}
#endif


Create_func_ucase Create_func_ucase::s_singleton;

Item*
Create_func_ucase::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_ucase(arg1);
}


Create_func_uncompress Create_func_uncompress::s_singleton;

Item*
Create_func_uncompress::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_uncompress(arg1);
}


Create_func_uncompressed_length Create_func_uncompressed_length::s_singleton;

Item*
Create_func_uncompressed_length::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_uncompressed_length(arg1);
}


Create_func_unhex Create_func_unhex::s_singleton;

Item*
Create_func_unhex::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_unhex(arg1);
}


Create_func_unix_timestamp Create_func_unix_timestamp::s_singleton;

Item*
Create_func_unix_timestamp::create_native(THD *thd, LEX_STRING name,
                                          List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 0:
  {
    func= new (thd->mem_root) Item_func_unix_timestamp();
    thd->lex->safe_to_cache_query= 0;
    break;
  }
  case 1:
  {
    Item *param_1= item_list->pop();
    func= new (thd->mem_root) Item_func_unix_timestamp(param_1);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


Create_func_uuid Create_func_uuid::s_singleton;

Item*
Create_func_uuid::create_builder(THD *thd)
{
  DBUG_ENTER("Create_func_uuid::create");
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->safe_to_cache_query= 0;
  DBUG_RETURN(new (thd->mem_root) Item_func_uuid());
}


Create_func_uuid_short Create_func_uuid_short::s_singleton;

Item*
Create_func_uuid_short::create_builder(THD *thd)
{
  DBUG_ENTER("Create_func_uuid_short::create");
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  thd->lex->safe_to_cache_query= 0;
  DBUG_RETURN(new (thd->mem_root) Item_func_uuid_short());
}


Create_func_version Create_func_version::s_singleton;

Item*
Create_func_version::create_builder(THD *thd)
{
  thd->lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_FUNCTION);
  return new (thd->mem_root) Item_static_string_func("version()",
                                                     server_version,
                                                     (uint) strlen(server_version),
                                                     system_charset_info,
                                                     DERIVATION_SYSCONST);
}


Create_func_weekday Create_func_weekday::s_singleton;

Item*
Create_func_weekday::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_weekday(arg1, 0);
}


Create_func_weekofyear Create_func_weekofyear::s_singleton;

Item*
Create_func_weekofyear::create_1_arg(THD *thd, Item *arg1)
{
  Item *i1= new (thd->mem_root) Item_int((char*) "0", 3, 1);
  return new (thd->mem_root) Item_func_week(arg1, i1);
}


#ifdef HAVE_SPATIAL
Create_func_mbr_within Create_func_mbr_within::s_singleton;

Item*
Create_func_mbr_within::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_mbr_rel(arg1, arg2,
      Item_func::SP_WITHIN_FUNC);
}


Create_func_within Create_func_within::s_singleton;

Item*
Create_func_within::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_spatial_rel(arg1, arg2,
                                                   Item_func::SP_WITHIN_FUNC);
}
#endif


#ifdef HAVE_SPATIAL
Create_func_x Create_func_x::s_singleton;

Item*
Create_func_x::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_x(arg1);
}
#endif


Create_func_xml_extractvalue Create_func_xml_extractvalue::s_singleton;

Item*
Create_func_xml_extractvalue::create_2_arg(THD *thd, Item *arg1, Item *arg2)
{
  return new (thd->mem_root) Item_func_xml_extractvalue(arg1, arg2);
}


Create_func_xml_update Create_func_xml_update::s_singleton;

Item*
Create_func_xml_update::create_3_arg(THD *thd, Item *arg1, Item *arg2, Item *arg3)
{
  return new (thd->mem_root) Item_func_xml_update(arg1, arg2, arg3);
}


#ifdef HAVE_SPATIAL
Create_func_y Create_func_y::s_singleton;

Item*
Create_func_y::create_1_arg(THD *thd, Item *arg1)
{
  return new (thd->mem_root) Item_func_y(arg1);
}
#endif


Create_func_year_week Create_func_year_week::s_singleton;

Item*
Create_func_year_week::create_native(THD *thd, LEX_STRING name,
                                     List<Item> *item_list)
{
  Item *func= NULL;
  int arg_count= 0;

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

  switch (arg_count) {
  case 1:
  {
    Item *param_1= item_list->pop();
    Item *i0= new (thd->mem_root) Item_int((char*) "0", 0, 1);
    func= new (thd->mem_root) Item_func_yearweek(param_1, i0);
    break;
  }
  case 2:
  {
    Item *param_1= item_list->pop();
    Item *param_2= item_list->pop();
    func= new (thd->mem_root) Item_func_yearweek(param_1, param_2);
    break;
  }
  default:
  {
    my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name.str);
    break;
  }
  }

  return func;
}


struct Native_func_registry
{
  LEX_STRING name;
  Create_func *builder;
};

#define BUILDER(F) & F::s_singleton

#ifdef HAVE_SPATIAL
  #define GEOM_BUILDER(F) & F::s_singleton
#else
  #define GEOM_BUILDER(F) & Create_func_no_geom::s_singleton
#endif

/*
  MySQL native functions.
  MAINTAINER:
  - Keep sorted for human lookup. At runtime, a hash table is used.
  - do **NOT** conditionally (#ifdef, #ifndef) define a function *NAME*:
    doing so will cause user code that works against a --without-XYZ binary
    to fail with name collisions against a --with-XYZ binary.
    Use something similar to GEOM_BUILDER instead.
  - keep 1 line per entry, it makes grep | sort easier
*/

static Native_func_registry func_array[] =
{
  { { C_STRING_WITH_LEN("ABS") }, BUILDER(Create_func_abs)},
  { { C_STRING_WITH_LEN("ACOS") }, BUILDER(Create_func_acos)},
  { { C_STRING_WITH_LEN("ADDTIME") }, BUILDER(Create_func_addtime)},
  { { C_STRING_WITH_LEN("AES_DECRYPT") }, BUILDER(Create_func_aes_decrypt)},
  { { C_STRING_WITH_LEN("AES_ENCRYPT") }, BUILDER(Create_func_aes_encrypt)},
  { { C_STRING_WITH_LEN("AREA") }, GEOM_BUILDER(Create_func_area)},
  { { C_STRING_WITH_LEN("ASBINARY") }, GEOM_BUILDER(Create_func_as_wkb)},
  { { C_STRING_WITH_LEN("ASIN") }, BUILDER(Create_func_asin)},
  { { C_STRING_WITH_LEN("ASTEXT") }, GEOM_BUILDER(Create_func_as_wkt)},
  { { C_STRING_WITH_LEN("ASWKB") }, GEOM_BUILDER(Create_func_as_wkb)},
  { { C_STRING_WITH_LEN("ASWKT") }, GEOM_BUILDER(Create_func_as_wkt)},
  { { C_STRING_WITH_LEN("ATAN") }, BUILDER(Create_func_atan)},
  { { C_STRING_WITH_LEN("ATAN2") }, BUILDER(Create_func_atan)},
  { { C_STRING_WITH_LEN("BENCHMARK") }, BUILDER(Create_func_benchmark)},
  { { C_STRING_WITH_LEN("BIN") }, BUILDER(Create_func_bin)},
  { { C_STRING_WITH_LEN("BIT_COUNT") }, BUILDER(Create_func_bit_count)},
  { { C_STRING_WITH_LEN("BIT_LENGTH") }, BUILDER(Create_func_bit_length)},
  { { C_STRING_WITH_LEN("BUFFER") }, GEOM_BUILDER(Create_func_buffer)},
  { { C_STRING_WITH_LEN("CEIL") }, BUILDER(Create_func_ceiling)},
  { { C_STRING_WITH_LEN("CEILING") }, BUILDER(Create_func_ceiling)},
  { { C_STRING_WITH_LEN("CENTROID") }, GEOM_BUILDER(Create_func_centroid)},
  { { C_STRING_WITH_LEN("CHARACTER_LENGTH") }, BUILDER(Create_func_char_length)},
  { { C_STRING_WITH_LEN("CHAR_LENGTH") }, BUILDER(Create_func_char_length)},
  { { C_STRING_WITH_LEN("COERCIBILITY") }, BUILDER(Create_func_coercibility)},
  { { C_STRING_WITH_LEN("COLUMN_CHECK") }, BUILDER(Create_func_dyncol_check)},
  { { C_STRING_WITH_LEN("COLUMN_EXISTS") }, BUILDER(Create_func_dyncol_exists)},
  { { C_STRING_WITH_LEN("COLUMN_LIST") }, BUILDER(Create_func_dyncol_list)},
  { { C_STRING_WITH_LEN("COLUMN_JSON") }, BUILDER(Create_func_dyncol_json)},
  { { C_STRING_WITH_LEN("COMPRESS") }, BUILDER(Create_func_compress)},
  { { C_STRING_WITH_LEN("CONCAT") }, BUILDER(Create_func_concat)},
  { { C_STRING_WITH_LEN("CONCAT_WS") }, BUILDER(Create_func_concat_ws)},
  { { C_STRING_WITH_LEN("CONNECTION_ID") }, BUILDER(Create_func_connection_id)},
  { { C_STRING_WITH_LEN("CONV") }, BUILDER(Create_func_conv)},
  { { C_STRING_WITH_LEN("CONVERT_TZ") }, BUILDER(Create_func_convert_tz)},
  { { C_STRING_WITH_LEN("COS") }, BUILDER(Create_func_cos)},
  { { C_STRING_WITH_LEN("COT") }, BUILDER(Create_func_cot)},
  { { C_STRING_WITH_LEN("CRC32") }, BUILDER(Create_func_crc32)},
  { { C_STRING_WITH_LEN("CROSSES") }, GEOM_BUILDER(Create_func_crosses)},
  { { C_STRING_WITH_LEN("DATEDIFF") }, BUILDER(Create_func_datediff)},
  { { C_STRING_WITH_LEN("DATE_FORMAT") }, BUILDER(Create_func_date_format)},
  { { C_STRING_WITH_LEN("DAYNAME") }, BUILDER(Create_func_dayname)},
  { { C_STRING_WITH_LEN("DAYOFMONTH") }, BUILDER(Create_func_dayofmonth)},
  { { C_STRING_WITH_LEN("DAYOFWEEK") }, BUILDER(Create_func_dayofweek)},
  { { C_STRING_WITH_LEN("DAYOFYEAR") }, BUILDER(Create_func_dayofyear)},
  { { C_STRING_WITH_LEN("DECODE") }, BUILDER(Create_func_decode)},
  { { C_STRING_WITH_LEN("DEGREES") }, BUILDER(Create_func_degrees)},
  { { C_STRING_WITH_LEN("DES_DECRYPT") }, BUILDER(Create_func_des_decrypt)},
  { { C_STRING_WITH_LEN("DES_ENCRYPT") }, BUILDER(Create_func_des_encrypt)},
  { { C_STRING_WITH_LEN("DIMENSION") }, GEOM_BUILDER(Create_func_dimension)},
  { { C_STRING_WITH_LEN("DISJOINT") }, GEOM_BUILDER(Create_func_mbr_disjoint)},
  { { C_STRING_WITH_LEN("ELT") }, BUILDER(Create_func_elt)},
  { { C_STRING_WITH_LEN("ENCODE") }, BUILDER(Create_func_encode)},
  { { C_STRING_WITH_LEN("ENCRYPT") }, BUILDER(Create_func_encrypt)},
  { { C_STRING_WITH_LEN("ENDPOINT") }, GEOM_BUILDER(Create_func_endpoint)},
  { { C_STRING_WITH_LEN("ENVELOPE") }, GEOM_BUILDER(Create_func_envelope)},
  { { C_STRING_WITH_LEN("EQUALS") }, GEOM_BUILDER(Create_func_equals)},
  { { C_STRING_WITH_LEN("EXP") }, BUILDER(Create_func_exp)},
  { { C_STRING_WITH_LEN("EXPORT_SET") }, BUILDER(Create_func_export_set)},
  { { C_STRING_WITH_LEN("EXTERIORRING") }, GEOM_BUILDER(Create_func_exteriorring)},
  { { C_STRING_WITH_LEN("EXTRACTVALUE") }, BUILDER(Create_func_xml_extractvalue)},
  { { C_STRING_WITH_LEN("FIELD") }, BUILDER(Create_func_field)},
  { { C_STRING_WITH_LEN("FIND_IN_SET") }, BUILDER(Create_func_find_in_set)},
  { { C_STRING_WITH_LEN("FLOOR") }, BUILDER(Create_func_floor)},
  { { C_STRING_WITH_LEN("FORMAT") }, BUILDER(Create_func_format)},
  { { C_STRING_WITH_LEN("FOUND_ROWS") }, BUILDER(Create_func_found_rows)},
  { { C_STRING_WITH_LEN("FROM_DAYS") }, BUILDER(Create_func_from_days)},
  { { C_STRING_WITH_LEN("FROM_UNIXTIME") }, BUILDER(Create_func_from_unixtime)},
  { { C_STRING_WITH_LEN("GEOMCOLLFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("GEOMCOLLFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("GEOMETRYCOLLECTIONFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("GEOMETRYCOLLECTIONFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("GEOMETRYFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("GEOMETRYFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("GEOMETRYN") }, GEOM_BUILDER(Create_func_geometryn)},
  { { C_STRING_WITH_LEN("GEOMETRYTYPE") }, GEOM_BUILDER(Create_func_geometry_type)},
  { { C_STRING_WITH_LEN("GEOMFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("GEOMFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("GET_LOCK") }, BUILDER(Create_func_get_lock)},
  { { C_STRING_WITH_LEN("GLENGTH") }, GEOM_BUILDER(Create_func_glength)},
  { { C_STRING_WITH_LEN("GREATEST") }, BUILDER(Create_func_greatest)},
  { { C_STRING_WITH_LEN("HEX") }, BUILDER(Create_func_hex)},
  { { C_STRING_WITH_LEN("IFNULL") }, BUILDER(Create_func_ifnull)},
  { { C_STRING_WITH_LEN("INET_ATON") }, BUILDER(Create_func_inet_aton)},
  { { C_STRING_WITH_LEN("INET_NTOA") }, BUILDER(Create_func_inet_ntoa)},
  { { C_STRING_WITH_LEN("INSTR") }, BUILDER(Create_func_instr)},
  { { C_STRING_WITH_LEN("INTERIORRINGN") }, GEOM_BUILDER(Create_func_interiorringn)},
  { { C_STRING_WITH_LEN("INTERSECTS") }, GEOM_BUILDER(Create_func_mbr_intersects)},
  { { C_STRING_WITH_LEN("ISCLOSED") }, GEOM_BUILDER(Create_func_isclosed)},
  { { C_STRING_WITH_LEN("ISEMPTY") }, GEOM_BUILDER(Create_func_isempty)},
  { { C_STRING_WITH_LEN("ISNULL") }, BUILDER(Create_func_isnull)},
  { { C_STRING_WITH_LEN("ISSIMPLE") }, GEOM_BUILDER(Create_func_issimple)},
  { { C_STRING_WITH_LEN("IS_FREE_LOCK") }, BUILDER(Create_func_is_free_lock)},
  { { C_STRING_WITH_LEN("IS_USED_LOCK") }, BUILDER(Create_func_is_used_lock)},
  { { C_STRING_WITH_LEN("LAST_DAY") }, BUILDER(Create_func_last_day)},
  { { C_STRING_WITH_LEN("LAST_INSERT_ID") }, BUILDER(Create_func_last_insert_id)},
  { { C_STRING_WITH_LEN("LCASE") }, BUILDER(Create_func_lcase)},
  { { C_STRING_WITH_LEN("LEAST") }, BUILDER(Create_func_least)},
  { { C_STRING_WITH_LEN("LENGTH") }, BUILDER(Create_func_length)},
#ifndef DBUG_OFF
  { { C_STRING_WITH_LEN("LIKE_RANGE_MIN") }, BUILDER(Create_func_like_range_min)},
  { { C_STRING_WITH_LEN("LIKE_RANGE_MAX") }, BUILDER(Create_func_like_range_max)},
#endif
  { { C_STRING_WITH_LEN("LINEFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("LINEFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("LINESTRINGFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("LINESTRINGFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("LN") }, BUILDER(Create_func_ln)},
  { { C_STRING_WITH_LEN("LOAD_FILE") }, BUILDER(Create_func_load_file)},
  { { C_STRING_WITH_LEN("LOCATE") }, BUILDER(Create_func_locate)},
  { { C_STRING_WITH_LEN("LOG") }, BUILDER(Create_func_log)},
  { { C_STRING_WITH_LEN("LOG10") }, BUILDER(Create_func_log10)},
  { { C_STRING_WITH_LEN("LOG2") }, BUILDER(Create_func_log2)},
  { { C_STRING_WITH_LEN("LOWER") }, BUILDER(Create_func_lcase)},
  { { C_STRING_WITH_LEN("LPAD") }, BUILDER(Create_func_lpad)},
  { { C_STRING_WITH_LEN("LTRIM") }, BUILDER(Create_func_ltrim)},
  { { C_STRING_WITH_LEN("MAKEDATE") }, BUILDER(Create_func_makedate)},
  { { C_STRING_WITH_LEN("MAKETIME") }, BUILDER(Create_func_maketime)},
  { { C_STRING_WITH_LEN("MAKE_SET") }, BUILDER(Create_func_make_set)},
  { { C_STRING_WITH_LEN("MASTER_POS_WAIT") }, BUILDER(Create_func_master_pos_wait)},
  { { C_STRING_WITH_LEN("MBRCONTAINS") }, GEOM_BUILDER(Create_func_mbr_contains)},
  { { C_STRING_WITH_LEN("MBRDISJOINT") }, GEOM_BUILDER(Create_func_mbr_disjoint)},
  { { C_STRING_WITH_LEN("MBREQUAL") }, GEOM_BUILDER(Create_func_mbr_equals)},
  { { C_STRING_WITH_LEN("MBRINTERSECTS") }, GEOM_BUILDER(Create_func_mbr_intersects)},
  { { C_STRING_WITH_LEN("MBROVERLAPS") }, GEOM_BUILDER(Create_func_mbr_overlaps)},
  { { C_STRING_WITH_LEN("MBRTOUCHES") }, GEOM_BUILDER(Create_func_touches)},
  { { C_STRING_WITH_LEN("MBRWITHIN") }, GEOM_BUILDER(Create_func_mbr_within)},
  { { C_STRING_WITH_LEN("MD5") }, BUILDER(Create_func_md5)},
  { { C_STRING_WITH_LEN("MLINEFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("MLINEFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("MONTHNAME") }, BUILDER(Create_func_monthname)},
  { { C_STRING_WITH_LEN("MPOINTFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("MPOINTFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("MPOLYFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("MPOLYFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("MULTILINESTRINGFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("MULTILINESTRINGFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("MULTIPOINTFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("MULTIPOINTFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("MULTIPOLYGONFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("MULTIPOLYGONFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("NAME_CONST") }, BUILDER(Create_func_name_const)},
  { { C_STRING_WITH_LEN("NULLIF") }, BUILDER(Create_func_nullif)},
  { { C_STRING_WITH_LEN("NUMGEOMETRIES") }, GEOM_BUILDER(Create_func_numgeometries)},
  { { C_STRING_WITH_LEN("NUMINTERIORRINGS") }, GEOM_BUILDER(Create_func_numinteriorring)},
  { { C_STRING_WITH_LEN("NUMPOINTS") }, GEOM_BUILDER(Create_func_numpoints)},
  { { C_STRING_WITH_LEN("OCT") }, BUILDER(Create_func_oct)},
  { { C_STRING_WITH_LEN("OCTET_LENGTH") }, BUILDER(Create_func_length)},
  { { C_STRING_WITH_LEN("ORD") }, BUILDER(Create_func_ord)},
  { { C_STRING_WITH_LEN("OVERLAPS") }, GEOM_BUILDER(Create_func_mbr_overlaps)},
  { { C_STRING_WITH_LEN("PERIOD_ADD") }, BUILDER(Create_func_period_add)},
  { { C_STRING_WITH_LEN("PERIOD_DIFF") }, BUILDER(Create_func_period_diff)},
  { { C_STRING_WITH_LEN("PI") }, BUILDER(Create_func_pi)},
  { { C_STRING_WITH_LEN("POINTFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("POINTFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("POINTN") }, GEOM_BUILDER(Create_func_pointn)},
  { { C_STRING_WITH_LEN("POLYFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("POLYFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("POLYGONFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("POLYGONFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("POW") }, BUILDER(Create_func_pow)},
  { { C_STRING_WITH_LEN("POWER") }, BUILDER(Create_func_pow)},
  { { C_STRING_WITH_LEN("QUOTE") }, BUILDER(Create_func_quote)},
  { { C_STRING_WITH_LEN("RADIANS") }, BUILDER(Create_func_radians)},
  { { C_STRING_WITH_LEN("RAND") }, BUILDER(Create_func_rand)},
  { { C_STRING_WITH_LEN("RELEASE_LOCK") }, BUILDER(Create_func_release_lock)},
  { { C_STRING_WITH_LEN("REVERSE") }, BUILDER(Create_func_reverse)},
  { { C_STRING_WITH_LEN("ROUND") }, BUILDER(Create_func_round)},
  { { C_STRING_WITH_LEN("RPAD") }, BUILDER(Create_func_rpad)},
  { { C_STRING_WITH_LEN("RTRIM") }, BUILDER(Create_func_rtrim)},
  { { C_STRING_WITH_LEN("SEC_TO_TIME") }, BUILDER(Create_func_sec_to_time)},
  { { C_STRING_WITH_LEN("SHA") }, BUILDER(Create_func_sha)},
  { { C_STRING_WITH_LEN("SHA1") }, BUILDER(Create_func_sha)},
  { { C_STRING_WITH_LEN("SHA2") }, BUILDER(Create_func_sha2)},
  { { C_STRING_WITH_LEN("SIGN") }, BUILDER(Create_func_sign)},
  { { C_STRING_WITH_LEN("SIN") }, BUILDER(Create_func_sin)},
  { { C_STRING_WITH_LEN("SLEEP") }, BUILDER(Create_func_sleep)},
  { { C_STRING_WITH_LEN("SOUNDEX") }, BUILDER(Create_func_soundex)},
  { { C_STRING_WITH_LEN("SPACE") }, BUILDER(Create_func_space)},
  { { C_STRING_WITH_LEN("SQRT") }, BUILDER(Create_func_sqrt)},
  { { C_STRING_WITH_LEN("SRID") }, GEOM_BUILDER(Create_func_srid)},
  { { C_STRING_WITH_LEN("STARTPOINT") }, GEOM_BUILDER(Create_func_startpoint)},
  { { C_STRING_WITH_LEN("STRCMP") }, BUILDER(Create_func_strcmp)},
  { { C_STRING_WITH_LEN("STR_TO_DATE") }, BUILDER(Create_func_str_to_date)},
  { { C_STRING_WITH_LEN("ST_AREA") }, GEOM_BUILDER(Create_func_area)},
  { { C_STRING_WITH_LEN("ST_ASBINARY") }, GEOM_BUILDER(Create_func_as_wkb)},
  { { C_STRING_WITH_LEN("ST_ASTEXT") }, GEOM_BUILDER(Create_func_as_wkt)},
  { { C_STRING_WITH_LEN("ST_ASWKB") }, GEOM_BUILDER(Create_func_as_wkb)},
  { { C_STRING_WITH_LEN("ST_ASWKT") }, GEOM_BUILDER(Create_func_as_wkt)},
  { { C_STRING_WITH_LEN("ST_BUFFER") }, GEOM_BUILDER(Create_func_buffer)},
  { { C_STRING_WITH_LEN("ST_CENTROID") }, GEOM_BUILDER(Create_func_centroid)},
  { { C_STRING_WITH_LEN("ST_CONTAINS") }, GEOM_BUILDER(Create_func_contains)},
  { { C_STRING_WITH_LEN("ST_CROSSES") }, GEOM_BUILDER(Create_func_crosses)},
  { { C_STRING_WITH_LEN("ST_DIFFERENCE") }, GEOM_BUILDER(Create_func_difference)},
  { { C_STRING_WITH_LEN("ST_DIMENSION") }, GEOM_BUILDER(Create_func_dimension)},
  { { C_STRING_WITH_LEN("ST_DISJOINT") }, GEOM_BUILDER(Create_func_disjoint)},
  { { C_STRING_WITH_LEN("ST_DISTANCE") }, GEOM_BUILDER(Create_func_distance)},
  { { C_STRING_WITH_LEN("ST_ENDPOINT") }, GEOM_BUILDER(Create_func_endpoint)},
  { { C_STRING_WITH_LEN("ST_ENVELOPE") }, GEOM_BUILDER(Create_func_envelope)},
  { { C_STRING_WITH_LEN("ST_EQUALS") }, GEOM_BUILDER(Create_func_equals)},
  { { C_STRING_WITH_LEN("ST_EXTERIORRING") }, GEOM_BUILDER(Create_func_exteriorring)},
  { { C_STRING_WITH_LEN("ST_GEOMCOLLFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_GEOMCOLLFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_GEOMETRYCOLLECTIONFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_GEOMETRYCOLLECTIONFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_GEOMETRYFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_GEOMETRYFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_GEOMETRYN") }, GEOM_BUILDER(Create_func_geometryn)},
  { { C_STRING_WITH_LEN("ST_GEOMETRYTYPE") }, GEOM_BUILDER(Create_func_geometry_type)},
  { { C_STRING_WITH_LEN("ST_GEOMFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_GEOMFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_EQUALS") }, GEOM_BUILDER(Create_func_equals)},
  { { C_STRING_WITH_LEN("ST_INTERIORRINGN") }, GEOM_BUILDER(Create_func_interiorringn)},
  { { C_STRING_WITH_LEN("ST_INTERSECTS") }, GEOM_BUILDER(Create_func_intersects)},
  { { C_STRING_WITH_LEN("ST_INTERSECTION") }, GEOM_BUILDER(Create_func_intersection)},
  { { C_STRING_WITH_LEN("ST_ISCLOSED") }, GEOM_BUILDER(Create_func_isclosed)},
  { { C_STRING_WITH_LEN("ST_ISEMPTY") }, GEOM_BUILDER(Create_func_isempty)},
  { { C_STRING_WITH_LEN("ST_ISSIMPLE") }, GEOM_BUILDER(Create_func_issimple)},
  { { C_STRING_WITH_LEN("ST_LENGTH") }, GEOM_BUILDER(Create_func_glength)},
  { { C_STRING_WITH_LEN("ST_LINEFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_LINEFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_LINESTRINGFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_LINESTRINGFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_NUMGEOMETRIES") }, GEOM_BUILDER(Create_func_numgeometries)},
  { { C_STRING_WITH_LEN("ST_NUMINTERIORRINGS") }, GEOM_BUILDER(Create_func_numinteriorring)},
  { { C_STRING_WITH_LEN("ST_NUMPOINTS") }, GEOM_BUILDER(Create_func_numpoints)},
  { { C_STRING_WITH_LEN("ST_OVERLAPS") }, GEOM_BUILDER(Create_func_overlaps)},
  { { C_STRING_WITH_LEN("ST_POINTFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_POINTFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_POINTN") }, GEOM_BUILDER(Create_func_pointn)},
  { { C_STRING_WITH_LEN("ST_POLYFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_POLYFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_POLYGONFROMTEXT") }, GEOM_BUILDER(Create_func_geometry_from_text)},
  { { C_STRING_WITH_LEN("ST_POLYGONFROMWKB") }, GEOM_BUILDER(Create_func_geometry_from_wkb)},
  { { C_STRING_WITH_LEN("ST_SRID") }, GEOM_BUILDER(Create_func_srid)},
  { { C_STRING_WITH_LEN("ST_STARTPOINT") }, GEOM_BUILDER(Create_func_startpoint)},
  { { C_STRING_WITH_LEN("ST_SYMDIFFERENCE") }, GEOM_BUILDER(Create_func_symdifference)},
  { { C_STRING_WITH_LEN("ST_TOUCHES") }, GEOM_BUILDER(Create_func_touches)},
  { { C_STRING_WITH_LEN("ST_UNION") }, GEOM_BUILDER(Create_func_union)},
  { { C_STRING_WITH_LEN("ST_WITHIN") }, GEOM_BUILDER(Create_func_within)},
  { { C_STRING_WITH_LEN("ST_X") }, GEOM_BUILDER(Create_func_x)},
  { { C_STRING_WITH_LEN("ST_Y") }, GEOM_BUILDER(Create_func_y)},
  { { C_STRING_WITH_LEN("SUBSTRING_INDEX") }, BUILDER(Create_func_substr_index)},
  { { C_STRING_WITH_LEN("SUBTIME") }, BUILDER(Create_func_subtime)},
  { { C_STRING_WITH_LEN("TAN") }, BUILDER(Create_func_tan)},
  { { C_STRING_WITH_LEN("TIMEDIFF") }, BUILDER(Create_func_timediff)},
  { { C_STRING_WITH_LEN("TIME_FORMAT") }, BUILDER(Create_func_time_format)},
  { { C_STRING_WITH_LEN("TIME_TO_SEC") }, BUILDER(Create_func_time_to_sec)},
  { { C_STRING_WITH_LEN("TOUCHES") }, GEOM_BUILDER(Create_func_touches)},
  { { C_STRING_WITH_LEN("TO_DAYS") }, BUILDER(Create_func_to_days)},
  { { C_STRING_WITH_LEN("TO_SECONDS") }, BUILDER(Create_func_to_seconds)},
  { { C_STRING_WITH_LEN("UCASE") }, BUILDER(Create_func_ucase)},
  { { C_STRING_WITH_LEN("UNCOMPRESS") }, BUILDER(Create_func_uncompress)},
  { { C_STRING_WITH_LEN("UNCOMPRESSED_LENGTH") }, BUILDER(Create_func_uncompressed_length)},
  { { C_STRING_WITH_LEN("UNHEX") }, BUILDER(Create_func_unhex)},
  { { C_STRING_WITH_LEN("UNIX_TIMESTAMP") }, BUILDER(Create_func_unix_timestamp)},
  { { C_STRING_WITH_LEN("UPDATEXML") }, BUILDER(Create_func_xml_update)},
  { { C_STRING_WITH_LEN("UPPER") }, BUILDER(Create_func_ucase)},
  { { C_STRING_WITH_LEN("UUID") }, BUILDER(Create_func_uuid)},
  { { C_STRING_WITH_LEN("UUID_SHORT") }, BUILDER(Create_func_uuid_short)},
  { { C_STRING_WITH_LEN("VERSION") }, BUILDER(Create_func_version)},
  { { C_STRING_WITH_LEN("WEEKDAY") }, BUILDER(Create_func_weekday)},
  { { C_STRING_WITH_LEN("WEEKOFYEAR") }, BUILDER(Create_func_weekofyear)},
  { { C_STRING_WITH_LEN("WITHIN") }, GEOM_BUILDER(Create_func_within)},
  { { C_STRING_WITH_LEN("X") }, GEOM_BUILDER(Create_func_x)},
  { { C_STRING_WITH_LEN("Y") }, GEOM_BUILDER(Create_func_y)},
  { { C_STRING_WITH_LEN("YEARWEEK") }, BUILDER(Create_func_year_week)},

  { {0, 0}, NULL}
};

static HASH native_functions_hash;

extern "C" uchar*
get_native_fct_hash_key(const uchar *buff, size_t *length,
                        my_bool /* unused */)
{
  Native_func_registry *func= (Native_func_registry*) buff;
  *length= func->name.length;
  return (uchar*) func->name.str;
}

/*
  Load the hash table for native functions.
  Note: this code is not thread safe, and is intended to be used at server
  startup only (before going multi-threaded)
*/

int item_create_init()
{
  Native_func_registry *func;

  DBUG_ENTER("item_create_init");

  if (my_hash_init(& native_functions_hash,
                   system_charset_info,
                   array_elements(func_array),
                   0,
                   0,
                   (my_hash_get_key) get_native_fct_hash_key,
                   NULL,                          /* Nothing to free */
                   MYF(0)))
    DBUG_RETURN(1);

  for (func= func_array; func->builder != NULL; func++)
  {
    if (my_hash_insert(& native_functions_hash, (uchar*) func))
      DBUG_RETURN(1);
  }

#ifndef DBUG_OFF
  for (uint i=0 ; i < native_functions_hash.records ; i++)
  {
    func= (Native_func_registry*) my_hash_element(& native_functions_hash, i);
    DBUG_PRINT("info", ("native function: %s  length: %u",
                        func->name.str, (uint) func->name.length));
  }
#endif

  DBUG_RETURN(0);
}

/*
  Empty the hash table for native functions.
  Note: this code is not thread safe, and is intended to be used at server
  shutdown only (after thread requests have been executed).
*/

void item_create_cleanup()
{
  DBUG_ENTER("item_create_cleanup");
  my_hash_free(& native_functions_hash);
  DBUG_VOID_RETURN;
}

Create_func *
find_native_function_builder(THD *thd, LEX_STRING name)
{
  Native_func_registry *func;
  Create_func *builder= NULL;

  /* Thread safe */
  func= (Native_func_registry*) my_hash_search(& native_functions_hash,
                                               (uchar*) name.str,
                                               name.length);

  if (func)
  {
    builder= func->builder;
  }

  return builder;
}

Create_qfunc *
find_qualified_function_builder(THD *thd)
{
  return & Create_sp_func::s_singleton;
}


Item *
create_func_cast(THD *thd, Item *a, Cast_target cast_type,
                 const char *c_len, const char *c_dec,
                 CHARSET_INFO *cs)
{
  Item *UNINIT_VAR(res);
  ulonglong length= 0, decimals= 0;
  int error;
  
  /*
    We don't have to check for error here as sql_yacc.yy has guaranteed
    that the values are in range of ulonglong
  */
  if (c_len)
    length= (ulonglong) my_strtoll10(c_len, NULL, &error);
  if (c_dec)
    decimals= (ulonglong) my_strtoll10(c_dec, NULL, &error);

  switch (cast_type) {
  case ITEM_CAST_BINARY:
    res= new (thd->mem_root) Item_func_binary(a);
    break;
  case ITEM_CAST_SIGNED_INT:
    res= new (thd->mem_root) Item_func_signed(a);
    break;
  case ITEM_CAST_UNSIGNED_INT:
    res= new (thd->mem_root) Item_func_unsigned(a);
    break;
  case ITEM_CAST_DATE:
    res= new (thd->mem_root) Item_date_typecast(a);
    break;
  case ITEM_CAST_TIME:
    if (decimals > MAX_DATETIME_PRECISION)
    {
      wrong_precision_error(ER_TOO_BIG_PRECISION, a, decimals,
                            MAX_DATETIME_PRECISION);
      return 0;
    }
    res= new (thd->mem_root) Item_time_typecast(a, (uint) decimals);
    break;
  case ITEM_CAST_DATETIME:
    if (decimals > MAX_DATETIME_PRECISION)
    {
      wrong_precision_error(ER_TOO_BIG_PRECISION, a, decimals,
                            MAX_DATETIME_PRECISION);
      return 0;
    }
    res= new (thd->mem_root) Item_datetime_typecast(a, (uint) decimals);
    break;
  case ITEM_CAST_DECIMAL:
  {
    ulong len;
    uint dec;
    if (get_length_and_scale(length, decimals, &len, &dec,
                             DECIMAL_MAX_PRECISION, DECIMAL_MAX_SCALE,
                             a))
      return NULL;
    res= new (thd->mem_root) Item_decimal_typecast(a, len, dec);
    break;
  }
  case ITEM_CAST_DOUBLE:
  {
    ulong len;
    uint dec;

    if (!c_len)
    {
      length=   DBL_DIG+7;
      decimals= NOT_FIXED_DEC;
    }
    else if (get_length_and_scale(length, decimals, &len, &dec,
                                  DECIMAL_MAX_PRECISION, NOT_FIXED_DEC-1,
                                  a))
      return NULL;
    res= new (thd->mem_root) Item_double_typecast(a, (uint) length,
                                                  (uint) decimals);
    break;
  }
  case ITEM_CAST_CHAR:
  {
    int len= -1;
    CHARSET_INFO *real_cs= (cs ? cs : thd->variables.collation_connection);
    if (c_len)
    {
      if (length > MAX_FIELD_BLOBLENGTH)
      {
        char buff[1024];
        String buf(buff, sizeof(buff), system_charset_info);
        my_error(ER_TOO_BIG_DISPLAYWIDTH, MYF(0), item_name(a, &buf),
                 MAX_FIELD_BLOBLENGTH);
        return NULL;
      }
      len= (int) length;
    }
    res= new (thd->mem_root) Item_char_typecast(a, len, real_cs);
    break;
  }
  default:
  {
    DBUG_ASSERT(0);
    res= 0;
    break;
  }
  }
  return res;
}


static List<Item> *create_func_dyncol_prepare(THD *thd,
                                              DYNCALL_CREATE_DEF **dfs,
                                              List<DYNCALL_CREATE_DEF> &list)
{
  DYNCALL_CREATE_DEF *def;
  List_iterator_fast<DYNCALL_CREATE_DEF> li(list);
  List<Item> *args= new (thd->mem_root) List<Item>;

  *dfs= (DYNCALL_CREATE_DEF *)alloc_root(thd->mem_root,
                                         sizeof(DYNCALL_CREATE_DEF) *
                                         list.elements);

  if (!args || !*dfs)
    return NULL;

  for (uint i= 0; (def= li++) ;)
  {
    dfs[0][i++]= *def;
    args->push_back(def->key);
    args->push_back(def->value);
  }
  return args;
}

Item *create_func_dyncol_create(THD *thd, List<DYNCALL_CREATE_DEF> &list)
{
  List<Item> *args;
  DYNCALL_CREATE_DEF *dfs;
  if (!(args= create_func_dyncol_prepare(thd, &dfs, list)))
    return NULL;

  return new (thd->mem_root) Item_func_dyncol_create(*args, dfs);
}

Item *create_func_dyncol_add(THD *thd, Item *str,
                             List<DYNCALL_CREATE_DEF> &list)
{
  List<Item> *args;
  DYNCALL_CREATE_DEF *dfs;

  if (!(args= create_func_dyncol_prepare(thd, &dfs, list)))
    return NULL;

  args->push_back(str);

  return new (thd->mem_root) Item_func_dyncol_add(*args, dfs);
}



Item *create_func_dyncol_delete(THD *thd, Item *str, List<Item> &nums)
{
  DYNCALL_CREATE_DEF *dfs;
  Item *key;
  List_iterator_fast<Item> it(nums);
  List<Item> *args= new (thd->mem_root) List<Item>;

  dfs= (DYNCALL_CREATE_DEF *)alloc_root(thd->mem_root,
                                        sizeof(DYNCALL_CREATE_DEF) *
                                        nums.elements);
  if (!args || !dfs)
    return NULL;

  for (uint i= 0; (key= it++); i++)
  {
    dfs[i].key= key;
    dfs[i].value= new Item_null();
    dfs[i].type= DYN_COL_INT;
    args->push_back(dfs[i].key);
    args->push_back(dfs[i].value);
  }

  args->push_back(str);

  return new (thd->mem_root) Item_func_dyncol_add(*args, dfs);
}


Item *create_func_dyncol_get(THD *thd,  Item *str, Item *num,
                             Cast_target cast_type,
                             const char *c_len, const char *c_dec,
                             CHARSET_INFO *cs)
{
  Item *res;

  if (!(res= new (thd->mem_root) Item_dyncol_get(str, num)))
    return res;                                 // Return NULL
  return create_func_cast(thd, res, cast_type, c_len, c_dec, cs);
}