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item_sum.h
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2000-08-31
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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* classes for sum functions */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
class Item_sum :public Item_result_field
{
public:
enum Sumfunctype {COUNT_FUNC,COUNT_DISTINCT_FUNC,SUM_FUNC,AVG_FUNC,MIN_FUNC,
MAX_FUNC, UNIQUE_USERS_FUNC,STD_FUNC,SUM_BIT_FUNC,
UDF_SUM_FUNC };
Item **args,*tmp_args[2];
uint arg_count;
bool quick_group; /* If incremental update of fields */
Item_sum() : arg_count(0),quick_group(1) { with_sum_func=1; }
Item_sum(Item *a) :quick_group(1)
{
arg_count=1;
args=tmp_args;
args[0]=a;
with_sum_func = 1;
}
Item_sum( Item *a, Item *b ) :quick_group(1)
{
arg_count=2;
args=tmp_args;
args[0]=a; args[1]=b;
with_sum_func=1;
}
Item_sum(List<Item> &list);
~Item_sum() { result_field=0; }
enum Type type() const { return SUM_FUNC_ITEM; }
virtual enum Sumfunctype sum_func () const=0;
virtual void reset()=0;
virtual bool add()=0;
virtual void reset_field()=0;
virtual void update_field(int offset)=0;
virtual bool keep_field_type(void) const { return 0; }
virtual void fix_length_and_dec() { maybe_null=1; null_value=1; }
virtual const char *func_name() const { return "?"; }
virtual Item *result_item(Field *field)
{ return new Item_field(field);}
table_map used_tables() const { return ~(table_map) 0; } /* Not used */
bool const_item() const { return 0; }
void update_used_tables() { }
void make_field(Send_field *field);
void print(String *str);
void fix_num_length_and_dec();
virtual bool setup(THD *thd) {return 0;}
};
class Item_sum_num :public Item_sum
{
public:
Item_sum_num() :Item_sum() {}
Item_sum_num(Item *item_par) :Item_sum(item_par) {}
Item_sum_num(Item *a, Item* b) :Item_sum(a,b) {}
Item_sum_num(List<Item> &list) :Item_sum(list) {}
bool fix_fields(THD *,struct st_table_list *);
longlong val_int() { return (longlong) val(); } /* Real as default */
String *val_str(String*str);
void reset_field();
};
class Item_sum_int :public Item_sum_num
{
void fix_length_and_dec()
{ decimals=0; max_length=21; maybe_null=null_value=0; }
public:
Item_sum_int(Item *item_par) :Item_sum_num(item_par) {}
Item_sum_int(List<Item> &list) :Item_sum_num(list) {}
double val() { return (double) val_int(); }
String *val_str(String*str);
enum Item_result result_type () const { return INT_RESULT; }
};
class Item_sum_sum :public Item_sum_num
{
double sum;
void fix_length_and_dec() { maybe_null=null_value=1; }
public:
Item_sum_sum(Item *item_par) :Item_sum_num(item_par),sum(0.0) {}
enum Sumfunctype sum_func () const {return SUM_FUNC;}
void reset();
bool add();
double val();
void reset_field();
void update_field(int offset);
const char *func_name() const { return "sum"; }
};
class Item_sum_count :public Item_sum_int
{
longlong count;
table_map used_table_cache;
public:
Item_sum_count(Item *item_par)
:Item_sum_int(item_par),count(0),used_table_cache(~(table_map) 0)
{}
table_map used_tables() const { return used_table_cache; }
bool const_item() const { return !used_table_cache; }
enum Sumfunctype sum_func () const { return COUNT_FUNC; }
void reset();
bool add();
void make_const(longlong count_arg) { count=count_arg; used_table_cache=0; }
longlong val_int();
void reset_field();
void update_field(int offset);
const char *func_name() const { return "count"; }
};
class TMP_TABLE_PARAM;
class Item_sum_count_distinct :public Item_sum_int
{
TABLE *table;
table_map used_table_cache;
bool fix_fields(THD *thd,TABLE_LIST *tables);
TMP_TABLE_PARAM *tmp_table_param;
public:
Item_sum_count_distinct(List<Item> &list)
:Item_sum_int(list),table(0),used_table_cache(~(table_map) 0),
tmp_table_param(0)
{ quick_group=0; }
~Item_sum_count_distinct();
table_map used_tables() const { return used_table_cache; }
enum Sumfunctype sum_func () const { return COUNT_DISTINCT_FUNC; }
void reset();
bool add();
longlong val_int();
void reset_field() { return ;} // Never called
void update_field(int offset) { return ; } // Never called
const char *func_name() const { return "count_distinct"; }
bool setup(THD *thd);
};
/* Item to get the value of a stored sum function */
class Item_avg_field :public Item_result_field
{
public:
Field *field;
Item_avg_field(Item_sum_avg *item);
enum Type type() const { return FIELD_AVG_ITEM; }
double val();
longlong val_int() { return (longlong) val(); }
String *val_str(String*);
void make_field(Send_field *field);
void fix_length_and_dec() {}
};
class Item_sum_avg :public Item_sum_num
{
void fix_length_and_dec() { decimals+=4; maybe_null=1; }
double sum;
ulonglong count;
public:
Item_sum_avg(Item *item_par) :Item_sum_num(item_par),count(0) {}
enum Sumfunctype sum_func () const {return AVG_FUNC;}
void reset();
bool add();
double val();
void reset_field();
void update_field(int offset);
Item *result_item(Field *field)
{ return new Item_avg_field(this); }
const char *func_name() const { return "avg"; }
};
class Item_std_field :public Item_result_field
{
public:
Field *field;
Item_std_field(Item_sum_std *item);
enum Type type() const { return FIELD_STD_ITEM; }
double val();
longlong val_int() { return (longlong) val(); }
String *val_str(String*);
void make_field(Send_field *field);
void fix_length_and_dec() {}
};
class Item_sum_std :public Item_sum_num
{
double sum;
double sum_sqr;
ulonglong count;
void fix_length_and_dec() { decimals+=4; maybe_null=1; }
public:
Item_sum_std(Item *item_par) :Item_sum_num(item_par),count(0) {}
enum Sumfunctype sum_func () const { return STD_FUNC; }
void reset();
bool add();
double val();
void reset_field();
void update_field(int offset);
Item *result_item(Field *field)
{ return new Item_std_field(this); }
const char *func_name() const { return "std"; }
};
// This class is a string or number function depending on num_func
class Item_sum_hybrid :public Item_sum
{
protected:
String value,tmp_value;
double sum;
Item_result hybrid_type;
int cmp_sign;
table_map used_table_cache;
public:
Item_sum_hybrid(Item *item_par,int sign) :Item_sum(item_par),cmp_sign(sign),
used_table_cache(~(table_map) 0)
{}
bool fix_fields(THD *,struct st_table_list *);
table_map used_tables() const { return used_table_cache; }
bool const_item() const { return !used_table_cache; }
void reset()
{
sum=0.0;
value.length(0);
null_value=1;
add();
}
double val();
longlong val_int() { return (longlong) val(); } /* Real as default */
void reset_field();
String *val_str(String *);
void make_const() { used_table_cache=0; }
bool keep_field_type(void) const { return 1; }
enum Item_result result_type () const { return hybrid_type; }
void update_field(int offset);
void min_max_update_str_field(int offset);
void min_max_update_real_field(int offset);
void min_max_update_int_field(int offset);
};
class Item_sum_min :public Item_sum_hybrid
{
public:
Item_sum_min(Item *item_par) :Item_sum_hybrid(item_par,1) {}
enum Sumfunctype sum_func () const {return MIN_FUNC;}
bool add();
const char *func_name() const { return "min"; }
};
class Item_sum_max :public Item_sum_hybrid
{
public:
Item_sum_max(Item *item_par) :Item_sum_hybrid(item_par,-1) {}
enum Sumfunctype sum_func () const {return MAX_FUNC;}
bool add();
const char *func_name() const { return "max"; }
};
class Item_sum_bit :public Item_sum_int
{
protected:
ulonglong reset_bits,bits;
public:
Item_sum_bit(Item *item_par,ulonglong reset_arg)
:Item_sum_int(item_par),reset_bits(reset_arg),bits(reset_arg) {}
enum Sumfunctype sum_func () const {return SUM_BIT_FUNC;}
void reset();
longlong val_int();
void reset_field();
};
class Item_sum_or :public Item_sum_bit
{
public:
Item_sum_or(Item *item_par) :Item_sum_bit(item_par,LL(0)) {}
bool add();
void update_field(int offset);
const char *func_name() const { return "bit_or"; }
};
class Item_sum_and :public Item_sum_bit
{
public:
Item_sum_and(Item *item_par) :Item_sum_bit(item_par, ~(ulonglong) LL(0)) {}
bool add();
void update_field(int offset);
const char *func_name() const { return "bit_and"; }
};
/*
** user defined aggregates
*/
#ifdef HAVE_DLOPEN
class Item_udf_sum : public Item_sum
{
protected:
udf_handler udf;
public:
Item_udf_sum(udf_func *udf_arg) :Item_sum(), udf(udf_arg) { quick_group=0;}
Item_udf_sum( udf_func *udf_arg, List<Item> &list )
:Item_sum( list ), udf(udf_arg)
{ quick_group=0;}
~Item_udf_sum() {}
const char *func_name() const { return udf.name(); }
bool fix_fields(THD *thd,struct st_table_list *tables)
{
return udf.fix_fields(thd,tables,this,this->arg_count,this->args);
}
enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
virtual bool have_field_update(void) const { return 0; }
void reset();
bool add();
void reset_field() {};
void update_field(int offset_arg) {};
};
class Item_sum_udf_float :public Item_udf_sum
{
public:
Item_sum_udf_float(udf_func *udf_arg) :Item_udf_sum(udf_arg) {}
Item_sum_udf_float(udf_func *udf_arg, List<Item> &list)
:Item_udf_sum(udf_arg,list) {}
~Item_sum_udf_float() {}
longlong val_int() { return (longlong) Item_sum_udf_float::val(); }
double val();
String *val_str(String*str);
void fix_length_and_dec() { fix_num_length_and_dec(); }
};
class Item_sum_udf_int :public Item_udf_sum
{
public:
Item_sum_udf_int(udf_func *udf_arg) :Item_udf_sum(udf_arg) {}
Item_sum_udf_int(udf_func *udf_arg, List<Item> &list)
:Item_udf_sum(udf_arg,list) {}
~Item_sum_udf_int() {}
longlong val_int();
double val() { return (double) Item_sum_udf_int::val_int(); }
String *val_str(String*str);
enum Item_result result_type () const { return INT_RESULT; }
void fix_length_and_dec() { decimals=0; max_length=21; }
};
class Item_sum_udf_str :public Item_udf_sum
{
public:
Item_sum_udf_str(udf_func *udf_arg) :Item_udf_sum(udf_arg) {}
Item_sum_udf_str(udf_func *udf_arg, List<Item> &list)
:Item_udf_sum(udf_arg,list) {}
~Item_sum_udf_str() {}
String *val_str(String *);
double val()
{
String *res; res=val_str(&str_value);
return res ? atof(res->c_ptr()) : 0.0;
}
longlong val_int()
{
String *res; res=val_str(&str_value);
return res ? strtoll(res->c_ptr(),(char**) 0,10) : (longlong) 0;
}
enum Item_result result_type () const { return STRING_RESULT; }
void fix_length_and_dec();
};
#else /* Dummy functions to get sql_yacc.cc compiled */
class Item_sum_udf_float :public Item_sum_num
{
public:
Item_sum_udf_float(udf_func *udf_arg) :Item_sum_num() {}
Item_sum_udf_float(udf_func *udf_arg, List<Item> &list) :Item_sum_num() {}
~Item_sum_udf_float() {}
enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
double val() { return 0.0; }
void reset() {}
bool add() { return 0; }
void update_field(int offset) {}
};
class Item_sum_udf_int :public Item_sum_num
{
public:
Item_sum_udf_int(udf_func *udf_arg) :Item_sum_num() {}
Item_sum_udf_int(udf_func *udf_arg, List<Item> &list) :Item_sum_num() {}
~Item_sum_udf_int() {}
enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
longlong val_int() { return 0; }
double val() { return 0; }
void reset() {}
bool add() { return 0; }
void update_field(int offset) {}
};
class Item_sum_udf_str :public Item_sum_num
{
public:
Item_sum_udf_str(udf_func *udf_arg) :Item_sum_num() {}
Item_sum_udf_str(udf_func *udf_arg, List<Item> &list) :Item_sum_num() {}
~Item_sum_udf_str() {}
String *val_str(String *) { null_value=1; return 0; }
double val() { null_value=1; return 0.0; }
longlong val_int() { null_value=1; return 0; }
enum Item_result result_type () const { return STRING_RESULT; }
void fix_length_and_dec() { maybe_null=1; max_length=0; }
enum Sumfunctype sum_func () const { return UDF_SUM_FUNC; }
void reset() {}
bool add() { return 0; }
void update_field(int offset) {}
};
#endif /* HAVE_DLOPEN */