#ifndef ITEM_FUNC_INCLUDED

#define ITEM_FUNC_INCLUDED

/* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.

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

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

the Free Software Foundation; version 2 of the License.

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

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

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

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

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

/* Function items used by mysql */

#ifdef HAVE_IEEEFP_H

extern "C" /* Bug in BSDI include file */

{

#include <ieeefp.h>

}

#endif

class Item_func :public Item_result_field

{

protected:

Item **args, *tmp_arg[2];

/// Value used in calculation of result of const_item()

bool const_item_cache;

/*

Allowed numbers of columns in result (usually 1, which means scalar value)

0 means get this number from first argument

*/

uint allowed_arg_cols;

/// Value used in calculation of result of used_tables()

table_map used_tables_cache;

/// Value used in calculation of result of not_null_tables()

table_map not_null_tables_cache;

public:

uint arg_count;

//bool const_item_cache;

enum Functype { UNKNOWN_FUNC,EQ_FUNC,EQUAL_FUNC,NE_FUNC,LT_FUNC,LE_FUNC,

GE_FUNC,GT_FUNC,FT_FUNC,

LIKE_FUNC,ISNULL_FUNC,ISNOTNULL_FUNC,

COND_AND_FUNC, COND_OR_FUNC, XOR_FUNC,

BETWEEN, IN_FUNC, MULT_EQUAL_FUNC,

INTERVAL_FUNC, ISNOTNULLTEST_FUNC,

SP_EQUALS_FUNC, SP_DISJOINT_FUNC,SP_INTERSECTS_FUNC,

SP_TOUCHES_FUNC,SP_CROSSES_FUNC,SP_WITHIN_FUNC,

SP_CONTAINS_FUNC,SP_OVERLAPS_FUNC,

SP_STARTPOINT,SP_ENDPOINT,SP_EXTERIORRING,

SP_POINTN,SP_GEOMETRYN,SP_INTERIORRINGN,

NOT_FUNC, NOT_ALL_FUNC,

NOW_FUNC, TRIG_COND_FUNC,

SUSERVAR_FUNC, GUSERVAR_FUNC, COLLATE_FUNC,

EXTRACT_FUNC, CHAR_TYPECAST_FUNC, FUNC_SP, UDF_FUNC,

NEG_FUNC, GSYSVAR_FUNC };

enum optimize_type { OPTIMIZE_NONE,OPTIMIZE_KEY,OPTIMIZE_OP, OPTIMIZE_NULL,

OPTIMIZE_EQUAL };

enum Type type() const { return FUNC_ITEM; }

virtual enum Functype functype() const { return UNKNOWN_FUNC; }

Item_func(void):

allowed_arg_cols(1), arg_count(0)

{

with_sum_func= 0;

}

Item_func(Item *a):

allowed_arg_cols(1), arg_count(1)

{

args= tmp_arg;

args[0]= a;

with_sum_func= a->with_sum_func;

}

Item_func(Item *a,Item *b):

allowed_arg_cols(1), arg_count(2)

{

args= tmp_arg;

args[0]= a; args[1]= b;

with_sum_func= a->with_sum_func || b->with_sum_func;

}

Item_func(Item *a,Item *b,Item *c):

allowed_arg_cols(1)

{

arg_count= 0;

if ((args= (Item**) sql_alloc(sizeof(Item*)*3)))

{

arg_count= 3;

args[0]= a; args[1]= b; args[2]= c;

with_sum_func= a->with_sum_func || b->with_sum_func || c->with_sum_func;

}

}

Item_func(Item *a,Item *b,Item *c,Item *d):

allowed_arg_cols(1)

{

arg_count= 0;

if ((args= (Item**) sql_alloc(sizeof(Item*)*4)))

{

arg_count= 4;

args[0]= a; args[1]= b; args[2]= c; args[3]= d;

with_sum_func= a->with_sum_func || b->with_sum_func ||

c->with_sum_func || d->with_sum_func;

}

}

Item_func(Item *a,Item *b,Item *c,Item *d,Item* e):

allowed_arg_cols(1)

{

arg_count= 5;

if ((args= (Item**) sql_alloc(sizeof(Item*)*5)))

{

args[0]= a; args[1]= b; args[2]= c; args[3]= d; args[4]= e;

with_sum_func= a->with_sum_func || b->with_sum_func ||

c->with_sum_func || d->with_sum_func || e->with_sum_func ;

}

}

Item_func(List<Item> &list);

// Constructor used for Item_cond_and/or (see Item comment)

Item_func(THD *thd, Item_func *item);

bool fix_fields(THD *, Item **ref);

void fix_after_pullout(st_select_lex *parent_select,

st_select_lex *removed_select, Item **ref);

table_map used_tables() const;

/**

Returns the pseudo tables depended upon in order to evaluate this

function expression. The default implementation returns the empty

set.

*/

virtual table_map get_initial_pseudo_tables() const { return 0; }

table_map not_null_tables() const;

void update_used_tables();

void set_used_tables(table_map map) { used_tables_cache= map; }

void set_not_null_tables(table_map map) { not_null_tables_cache= map; }

bool eq(const Item *item, bool binary_cmp) const;

virtual optimize_type select_optimize() const { return OPTIMIZE_NONE; }

virtual bool have_rev_func() const { return 0; }

virtual Item *key_item() const { return args[0]; }

virtual bool const_item() const { return const_item_cache; }

inline Item **arguments() const

{ DBUG_ASSERT(argument_count() > 0); return args; }

void set_arguments(List<Item> &list);

inline uint argument_count() const { return arg_count; }

inline void remove_arguments() { arg_count=0; }

void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array,

List<Item> &fields);

virtual void print(String *str, enum_query_type query_type);

void print_op(String *str, enum_query_type query_type);

void print_args(String *str, uint from, enum_query_type query_type);

virtual void fix_num_length_and_dec();

void count_only_length(Item **item, uint nitems);

void count_real_length();

void count_decimal_length();

void count_datetime_length(Item **item, uint nitems);

bool count_string_result_length(enum_field_types field_type,

Item **item, uint nitems);

inline bool get_arg0_date(MYSQL_TIME *ltime, uint fuzzy_date)

{

return (null_value=args[0]->get_date(ltime, fuzzy_date));

}

inline bool get_arg0_time(MYSQL_TIME *ltime)

{

return (null_value= args[0]->get_time(ltime));

}

bool is_null() {

update_null_value();

return null_value;

}

void signal_divide_by_null();

friend class udf_handler;

Field *tmp_table_field() { return result_field; }

Field *tmp_table_field(TABLE *t_arg);

Item *get_tmp_table_item(THD *thd);

my_decimal *val_decimal(my_decimal *);

bool agg_arg_charsets(DTCollation &c, Item **items, uint nitems,

uint flags, int item_sep)

{

return agg_item_charsets(c, func_name(), items, nitems, flags, item_sep);

}

/*

Aggregate arguments for string result, e.g: CONCAT(a,b)

- convert to @@character_set_connection if all arguments are numbers

- allow DERIVATION_NONE

*/

bool agg_arg_charsets_for_string_result(DTCollation &c,

Item **items, uint nitems,

int item_sep= 1)

{

return agg_item_charsets_for_string_result(c, func_name(),

items, nitems, item_sep);

}

/*

Aggregate arguments for comparison, e.g: a=b, a LIKE b, a RLIKE b

- don't convert to @@character_set_connection if all arguments are numbers

- don't allow DERIVATION_NONE

*/

bool agg_arg_charsets_for_comparison(DTCollation &c,

Item **items, uint nitems,

int item_sep= 1)

{

return agg_item_charsets_for_comparison(c, func_name(),

items, nitems, item_sep);

}

/*

Aggregate arguments for string result, when some comparison

is involved internally, e.g: REPLACE(a,b,c)

- convert to @@character_set_connection if all arguments are numbers

- disallow DERIVATION_NONE

*/

bool agg_arg_charsets_for_string_result_with_comparison(DTCollation &c,

Item **items,

uint nitems,

int item_sep= 1)

{

return agg_item_charsets_for_string_result_with_comparison(c, func_name(),

items, nitems,

item_sep);

}

bool walk(Item_processor processor, bool walk_subquery, uchar *arg);

Item *transform(Item_transformer transformer, uchar *arg);

Item* compile(Item_analyzer analyzer, uchar **arg_p,

Item_transformer transformer, uchar *arg_t);

void traverse_cond(Cond_traverser traverser,

void * arg, traverse_order order);

inline double fix_result(double value)

{

if (isfinite(value))

return value;

null_value=1;

return 0.0;

}

inline void raise_numeric_overflow(const char *type_name)

{

char buf[256];

String str(buf, sizeof(buf), system_charset_info);

str.length(0);

print(&str, QT_ORDINARY);

my_error(ER_DATA_OUT_OF_RANGE, MYF(0), type_name, str.c_ptr_safe());

}

inline double raise_float_overflow()

{

raise_numeric_overflow("DOUBLE");

return 0.0;

}

inline longlong raise_integer_overflow()

{

raise_numeric_overflow(unsigned_flag ? "BIGINT UNSIGNED": "BIGINT");

return 0;

}

inline int raise_decimal_overflow()

{

raise_numeric_overflow("DECIMAL");

return E_DEC_OVERFLOW;

}

/**

Throw an error if the input double number is not finite, i.e. is either

+/-INF or NAN.

*/

inline double check_float_overflow(double value)

{

return isfinite(value) ? value : raise_float_overflow();

}

/**

Throw an error if the input BIGINT value represented by the

(longlong value, bool unsigned flag) pair cannot be returned by the

function, i.e. is not compatible with this Item's unsigned_flag.

*/

inline longlong check_integer_overflow(longlong value, bool val_unsigned)

{

if ((unsigned_flag && !val_unsigned && value < 0) ||

(!unsigned_flag && val_unsigned &&

(ulonglong) value > (ulonglong) LONGLONG_MAX))

return raise_integer_overflow();

return value;

}

/**

Throw an error if the error code of a DECIMAL operation is E_DEC_OVERFLOW.

*/

inline int check_decimal_overflow(int error)

{

return (error == E_DEC_OVERFLOW) ? raise_decimal_overflow() : error;

}

bool has_timestamp_args()

{

DBUG_ASSERT(fixed == TRUE);

for (uint i= 0; i < arg_count; i++)

{

if (args[i]->type() == Item::FIELD_ITEM &&

args[i]->field_type() == MYSQL_TYPE_TIMESTAMP)

return TRUE;

}

return FALSE;

}

bool has_date_args()

{

DBUG_ASSERT(fixed == TRUE);

for (uint i= 0; i < arg_count; i++)

{

if (args[i]->type() == Item::FIELD_ITEM &&

(args[i]->field_type() == MYSQL_TYPE_DATE ||

args[i]->field_type() == MYSQL_TYPE_DATETIME))

return TRUE;

}

return FALSE;

}

bool has_time_args()

{

DBUG_ASSERT(fixed == TRUE);

for (uint i= 0; i < arg_count; i++)

{

if (args[i]->type() == Item::FIELD_ITEM &&

(args[i]->field_type() == MYSQL_TYPE_TIME ||

args[i]->field_type() == MYSQL_TYPE_DATETIME))

return TRUE;

}

return FALSE;

}

bool has_datetime_args()

{

DBUG_ASSERT(fixed == TRUE);

for (uint i= 0; i < arg_count; i++)

{

if (args[i]->type() == Item::FIELD_ITEM &&

args[i]->field_type() == MYSQL_TYPE_DATETIME)

return TRUE;

}

return FALSE;

}

/*

We assume the result of any function that has a TIMESTAMP argument to be

timezone-dependent, since a TIMESTAMP value in both numeric and string

contexts is interpreted according to the current timezone.

The only exception is UNIX_TIMESTAMP() which returns the internal

representation of a TIMESTAMP argument verbatim, and thus does not depend on

the timezone.

*/

virtual bool check_valid_arguments_processor(uchar *bool_arg)

{

return has_timestamp_args();

}

virtual bool find_function_processor (uchar *arg)

{

return functype() == *(Functype *) arg;

}

};

class Item_real_func :public Item_func

{

public:

Item_real_func() :Item_func() { collation.set_numeric(); }

Item_real_func(Item *a) :Item_func(a) { collation.set_numeric(); }

Item_real_func(Item *a,Item *b) :Item_func(a,b) { collation.set_numeric(); }

Item_real_func(List<Item> &list) :Item_func(list) { collation.set_numeric(); }

String *val_str(String*str);

my_decimal *val_decimal(my_decimal *decimal_value);

longlong val_int()

{ DBUG_ASSERT(fixed == 1); return (longlong) rint(val_real()); }

bool get_date(MYSQL_TIME *ltime, uint fuzzydate)

{

return get_date_from_real(ltime, fuzzydate);

}

bool get_time(MYSQL_TIME *ltime)

{

return get_time_from_real(ltime);

}

enum Item_result result_type () const { return REAL_RESULT; }

void fix_length_and_dec()

{ decimals= NOT_FIXED_DEC; max_length= float_length(decimals); }

};

class Item_func_numhybrid: public Item_func

{

protected:

Item_result hybrid_type;

public:

Item_func_numhybrid(Item *a) :Item_func(a), hybrid_type(REAL_RESULT)

{ collation.set_numeric(); }

Item_func_numhybrid(Item *a,Item *b)

:Item_func(a,b), hybrid_type(REAL_RESULT)

{ collation.set_numeric(); }

Item_func_numhybrid(List<Item> &list)

:Item_func(list), hybrid_type(REAL_RESULT)

{ collation.set_numeric(); }

enum Item_result result_type () const { return hybrid_type; }

void fix_length_and_dec();

void fix_num_length_and_dec();

virtual void find_num_type()= 0; /* To be called from fix_length_and_dec */

double val_real();

longlong val_int();

my_decimal *val_decimal(my_decimal *);

String *val_str(String*str);

bool get_date(MYSQL_TIME *ltime, uint fuzzydate);

bool get_time(MYSQL_TIME *ltime);

/**

@brief Performs the operation that this functions implements when the

result type is INT.

@return The result of the operation.

*/

virtual longlong int_op()= 0;

/**

@brief Performs the operation that this functions implements when the

result type is REAL.

@return The result of the operation.

*/

virtual double real_op()= 0;

/**

@brief Performs the operation that this functions implements when the

result type is DECIMAL.

@param A pointer where the DECIMAL value will be allocated.

@return

- 0 If the result is NULL

- The same pointer it was given, with the area initialized to the

result of the operation.

*/

virtual my_decimal *decimal_op(my_decimal *)= 0;

/**

@brief Performs the operation that this functions implements when the

result type is a string type.

@return The result of the operation.

*/

virtual String *str_op(String *)= 0;

/**

@brief Performs the operation that this functions implements when the

result type is MYSQL_TYPE_DATE or MYSQL_TYPE_DATETIME.

@return The result of the operation.

*/

virtual bool date_op(MYSQL_TIME *ltime, uint fuzzydate)= 0;

virtual bool time_op(MYSQL_TIME *ltime)= 0;

bool is_null() { update_null_value(); return null_value; }

};

/* function where type of result detected by first argument */

class Item_func_num1: public Item_func_numhybrid

{

public:

Item_func_num1(Item *a) :Item_func_numhybrid(a) {}

Item_func_num1(Item *a, Item *b) :Item_func_numhybrid(a, b) {}

void fix_num_length_and_dec();

void find_num_type();

String *str_op(String *str) { DBUG_ASSERT(0); return 0; }

bool date_op(MYSQL_TIME *ltime, uint fuzzydate)

{ DBUG_ASSERT(0); return 0; }

bool time_op(MYSQL_TIME *ltime)

{ DBUG_ASSERT(0); return 0; }

};

/* Base class for operations like '+', '-', '*' */

class Item_num_op :public Item_func_numhybrid

{

public:

Item_num_op(Item *a,Item *b) :Item_func_numhybrid(a, b) {}

virtual void result_precision()= 0;

virtual inline void print(String *str, enum_query_type query_type)

{

print_op(str, query_type);

}

void find_num_type();

String *str_op(String *str) { DBUG_ASSERT(0); return 0; }

bool date_op(MYSQL_TIME *ltime, uint fuzzydate)

{ DBUG_ASSERT(0); return 0; }

bool time_op(MYSQL_TIME *ltime)

{ DBUG_ASSERT(0); return 0; }

};

class Item_int_func :public Item_func

{

public:

Item_int_func() :Item_func()

{ collation.set_numeric(); fix_char_length(21); }

Item_int_func(Item *a) :Item_func(a)

{ collation.set_numeric(); fix_char_length(21); }

Item_int_func(Item *a,Item *b) :Item_func(a,b)

{ collation.set_numeric(); fix_char_length(21); }

Item_int_func(Item *a,Item *b,Item *c) :Item_func(a,b,c)

{ collation.set_numeric(); fix_char_length(21); }

Item_int_func(List<Item> &list) :Item_func(list)

{ collation.set_numeric(); fix_char_length(21); }

Item_int_func(THD *thd, Item_int_func *item) :Item_func(thd, item)

{ collation.set_numeric(); }

double val_real();

String *val_str(String*str);

bool get_date(MYSQL_TIME *ltime, uint fuzzydate)

{

return get_date_from_int(ltime, fuzzydate);

}

bool get_time(MYSQL_TIME *ltime)

{

return get_time_from_int(ltime);

}

enum Item_result result_type () const { return INT_RESULT; }

void fix_length_and_dec() {}

};

class Item_func_connection_id :public Item_int_func

{

longlong value;

public:

Item_func_connection_id() {}

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

void fix_length_and_dec();

bool fix_fields(THD *thd, Item **ref);

longlong val_int() { DBUG_ASSERT(fixed == 1); return value; }

};

class Item_func_signed :public Item_int_func

{

public:

Item_func_signed(Item *a) :Item_int_func(a)

{

unsigned_flag= 0;

}

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

longlong val_int();

longlong val_int_from_str(int *error);

void fix_length_and_dec()

{

fix_char_length(std::min<uint32>(args[0]->max_char_length(),

MY_INT64_NUM_DECIMAL_DIGITS));

}

virtual void print(String *str, enum_query_type query_type);

uint decimal_precision() const { return args[0]->decimal_precision(); }

};

class Item_func_unsigned :public Item_func_signed

{

public:

Item_func_unsigned(Item *a) :Item_func_signed(a)

{

unsigned_flag= 1;

}

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

longlong val_int();

virtual void print(String *str, enum_query_type query_type);

};

class Item_decimal_typecast :public Item_func

{

my_decimal decimal_value;

public:

Item_decimal_typecast(Item *a, int len, int dec) :Item_func(a)

{

decimals= dec;

collation.set_numeric();

fix_char_length(my_decimal_precision_to_length_no_truncation(len, dec,

unsigned_flag));

}

String *val_str(String *str);

double val_real();

longlong val_int();

bool get_date(MYSQL_TIME *ltime, uint fuzzydate)

{

return get_date_from_decimal(ltime, fuzzydate);

}

bool get_time(MYSQL_TIME *ltime)

{

return get_time_from_decimal(ltime);

}

my_decimal *val_decimal(my_decimal*);

enum Item_result result_type () const { return DECIMAL_RESULT; }

enum_field_types field_type() const { return MYSQL_TYPE_NEWDECIMAL; }

void fix_length_and_dec() {};

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

virtual void print(String *str, enum_query_type query_type);

};

class Item_func_additive_op :public Item_num_op

{

public:

Item_func_additive_op(Item *a,Item *b) :Item_num_op(a,b) {}

void result_precision();

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

class Item_func_plus :public Item_func_additive_op

{

public:

Item_func_plus(Item *a,Item *b) :Item_func_additive_op(a,b) {}

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

longlong int_op();

double real_op();

my_decimal *decimal_op(my_decimal *);

};

class Item_func_minus :public Item_func_additive_op

{

public:

Item_func_minus(Item *a,Item *b) :Item_func_additive_op(a,b) {}

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

longlong int_op();

double real_op();

my_decimal *decimal_op(my_decimal *);

void fix_length_and_dec();

};

class Item_func_mul :public Item_num_op

{

public:

Item_func_mul(Item *a,Item *b) :Item_num_op(a,b) {}

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

longlong int_op();

double real_op();

my_decimal *decimal_op(my_decimal *);

void result_precision();

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

class Item_func_div :public Item_num_op

{

public:

uint prec_increment;

Item_func_div(Item *a,Item *b) :Item_num_op(a,b) {}

longlong int_op() { DBUG_ASSERT(0); return 0; }

double real_op();

my_decimal *decimal_op(my_decimal *);

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

void fix_length_and_dec();

void result_precision();

};

class Item_func_int_div :public Item_int_func

{

public:

Item_func_int_div(Item *a,Item *b) :Item_int_func(a,b)

{}

longlong val_int();

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

void fix_length_and_dec();

virtual inline void print(String *str, enum_query_type query_type)

{

print_op(str, query_type);

}

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

class Item_func_mod :public Item_num_op

{

public:

Item_func_mod(Item *a,Item *b) :Item_num_op(a,b) {}

longlong int_op();

double real_op();

my_decimal *decimal_op(my_decimal *);

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

void result_precision();

void fix_length_and_dec();

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

class Item_func_neg :public Item_func_num1

{

public:

Item_func_neg(Item *a) :Item_func_num1(a) {}

double real_op();

longlong int_op();

my_decimal *decimal_op(my_decimal *);

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

enum Functype functype() const { return NEG_FUNC; }

void fix_length_and_dec();

void fix_num_length_and_dec();

uint decimal_precision() const { return args[0]->decimal_precision(); }

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

class Item_func_abs :public Item_func_num1

{

public:

Item_func_abs(Item *a) :Item_func_num1(a) {}

double real_op();

longlong int_op();

my_decimal *decimal_op(my_decimal *);

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

void fix_length_and_dec();

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

// A class to handle logarithmic and trigonometric functions

class Item_dec_func :public Item_real_func

{

public:

Item_dec_func(Item *a) :Item_real_func(a) {}

Item_dec_func(Item *a,Item *b) :Item_real_func(a,b) {}

void fix_length_and_dec()

{

decimals=NOT_FIXED_DEC; max_length=float_length(decimals);

maybe_null=1;

}

};

class Item_func_exp :public Item_dec_func

{

public:

Item_func_exp(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_ln :public Item_dec_func

{

public:

Item_func_ln(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_log :public Item_dec_func

{

public:

Item_func_log(Item *a) :Item_dec_func(a) {}

Item_func_log(Item *a,Item *b) :Item_dec_func(a,b) {}

double val_real();

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

};

class Item_func_log2 :public Item_dec_func

{

public:

Item_func_log2(Item *a) :Item_dec_func(a) {}

double val_real();

const char *func_name() const { return "log2"; }

};

class Item_func_log10 :public Item_dec_func

{

public:

Item_func_log10(Item *a) :Item_dec_func(a) {}

double val_real();

const char *func_name() const { return "log10"; }

};

class Item_func_sqrt :public Item_dec_func

{

public:

Item_func_sqrt(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_pow :public Item_dec_func

{

public:

Item_func_pow(Item *a,Item *b) :Item_dec_func(a,b) {}

double val_real();

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

};

class Item_func_acos :public Item_dec_func

{

public:

Item_func_acos(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_asin :public Item_dec_func

{

public:

Item_func_asin(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_atan :public Item_dec_func

{

public:

Item_func_atan(Item *a) :Item_dec_func(a) {}

Item_func_atan(Item *a,Item *b) :Item_dec_func(a,b) {}

double val_real();

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

};

class Item_func_cos :public Item_dec_func

{

public:

Item_func_cos(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_sin :public Item_dec_func

{

public:

Item_func_sin(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_tan :public Item_dec_func

{

public:

Item_func_tan(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_cot :public Item_dec_func

{

public:

Item_func_cot(Item *a) :Item_dec_func(a) {}

double val_real();

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

};

class Item_func_integer :public Item_int_func

{

public:

inline Item_func_integer(Item *a) :Item_int_func(a) {}

void fix_length_and_dec();

};

class Item_func_int_val :public Item_func_num1

{

public:

Item_func_int_val(Item *a) :Item_func_num1(a) {}

void fix_num_length_and_dec();

void find_num_type();

};

class Item_func_ceiling :public Item_func_int_val

{

public:

Item_func_ceiling(Item *a) :Item_func_int_val(a) {}

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

longlong int_op();

double real_op();

my_decimal *decimal_op(my_decimal *);

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

class Item_func_floor :public Item_func_int_val

{

public:

Item_func_floor(Item *a) :Item_func_int_val(a) {}

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

longlong int_op();

double real_op();

my_decimal *decimal_op(my_decimal *);

bool check_partition_func_processor(uchar *int_arg) {return FALSE;}

};

/* This handles round and truncate */

class Item_func_round :public Item_func_num1

{

bool truncate;

public:

Item_func_round(Item *a, Item *b, bool trunc_arg)

:Item_func_num1(a,b), truncate(trunc_arg) {}

const char *func_name() const { return truncate ? "truncate" : "round"; }

double real_op();

longlong int_op();

my_decimal *decimal_op(my_decimal *);

void fix_length_and_dec();

};

class Item_func_rand :public Item_real_func

{

struct rand_struct *rand;

bool first_eval; // TRUE if val_real() is called 1st time

public:

Item_func_rand(Item *a) :Item_real_func(a), rand(0), first_eval(TRUE) {}

Item_func_rand() :Item_real_func() {}

double val_real();

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

bool const_item() const { return 0; }

/**

This function is non-deterministic and hence depends on the

'RAND' pseudo-table.

@retval RAND_TABLE_BIT

*/

table_map get_initial_pseudo_tables() const { return RAND_TABLE_BIT; }

bool fix_fields(THD *thd, Item **ref);

void cleanup() { first_eval= TRUE; Item_real_func::cleanup(); }

private:

void seed_random (Item * val);

};

class Item_func_sign :public Item_int_func

{

public:

Item_func_sign(Item *a) :Item_int_func(a) {}

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

longlong val_int();

};

class Item_func_units :public Item_real_func

{

char *name;

double mul,add;

public:

Item_func_units(char *name_arg,Item *a,double mul_arg,double add_arg)

:Item_real_func(a),name(name_arg),mul(mul_arg),add(add_arg) {}

double val_real();

const char *func_name() const { return name; }

void fix_length_and_dec()

{ decimals= NOT_FIXED_DEC; max_length= float_length(decimals); }

};

class Item_func_min_max :public Item_func

{

Item_result cmp_type;

String tmp_value;

int cmp_sign;

/* TRUE <=> arguments should be compared in the DATETIME context. */

bool compare_as_dates;

/* An item used for issuing warnings while string to DATETIME conversion. */

Item *datetime_item;

THD *thd;

protected:

enum_field_types cached_field_type;

uint cmp_datetimes(longlong *value);

uint cmp_times(longlong *value);

public:

Item_func_min_max(List<Item> &list,int cmp_sign_arg) :Item_func(list),

cmp_type(INT_RESULT), cmp_sign(cmp_sign_arg), compare_as_dates(FALSE),

datetime_item(0) {}

double val_real();

longlong val_int();

String *val_str(String *);

my_decimal *val_decimal(my_decimal *);

bool get_date(MYSQL_TIME *ltime, uint fuzzydate);

bool get_time(MYSQL_TIME *ltime);

void fix_length_and_dec();

enum Item_result result_type () const

{

/*

If we compare as dates, then:

- field_type is MYSQL_TYPE_VARSTRING, MYSQL_TYPE_DATETIME

or MYSQL_TYPE_DATE.

- cmp_type is INT_RESULT or DECIMAL_RESULT,

depending on the amount of fractional digits.

We need to return STRING_RESULT in this case instead of cmp_type.

*/

return compare_as_dates ? STRING_RESULT : cmp_type;

}

enum Item_result cast_to_int_type () const

{

/*

make CAST(LEAST_OR_GREATEST(datetime_expr, varchar_expr))

return a number in format "YYYMMDDhhmmss".

*/

return compare_as_dates ? INT_RESULT : result_type();

}

enum_field_types field_type() const { return cached_field_type; }