home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Chip 2001 January
/
Chip_2001-01_cd1.bin
/
tema
/
mysql
/
mysql-3.23.28g-win-source.exe
/
sql
/
sql_analyse.h
< prev
next >
Wrap
C/C++ Source or Header
|
2000-08-31
|
9KB
|
293 lines
/* 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 */
/* Analyse database */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
#include <my_tree.h>
#define DEC_IN_AVG 4
typedef struct st_number_info
{
// if zerofill is true, the number must be zerofill, or string
bool negative, is_float, zerofill, maybe_zerofill;
int8 integers;
int8 decimals;
double dval;
ulonglong ullval;
} NUM_INFO;
typedef struct st_extreme_value_number_info
{
ulonglong ullval;
longlong llval;
double max_dval, min_dval;
} EV_NUM_INFO;
typedef struct st_tree_info
{
bool found;
String *str;
Item *item;
} TREE_INFO;
uint check_ulonglong(const char *str, uint length);
bool get_ev_num_info(EV_NUM_INFO *ev_info, NUM_INFO *info, const char *num);
bool test_if_number(NUM_INFO *info, const char *str, uint str_len);
int compare_double(const double *s, const double *t);
int compare_longlong(const longlong *s, const longlong *t);
int compare_ulonglong(const ulonglong *s, const ulonglong *t);
Procedure *proc_analyse_init(THD *thd, ORDER *param, select_result *result,
List<Item> &field_list);
void free_string(String*);
class analyse;
class field_info :public Sql_alloc
{
protected:
ulong treemem, tree_elements, empty, nulls, min_length, max_length;
uint room_in_tree;
my_bool found;
TREE tree;
Item *item;
analyse *pc;
public:
field_info(Item* a, analyse* b) : treemem(0), tree_elements(0), empty(0),
nulls(0), min_length(0), max_length(0), room_in_tree(1),
found(0),item(a), pc(b) {};
virtual ~field_info() { delete_tree(&tree); }
virtual void add() = 0;
virtual void get_opt_type(String*, ha_rows) = 0;
virtual String *get_min_arg(String *) = 0;
virtual String *get_max_arg(String *) = 0;
virtual String *avg(String*, ha_rows) = 0;
virtual String *std(String*, ha_rows) = 0;
virtual tree_walk_action collect_enum() = 0;
virtual uint decimals() { return 0; }
friend class analyse;
};
class field_str :public field_info
{
String min_arg, max_arg;
ulonglong sum;
bool must_be_blob, was_zero_fill, was_maybe_zerofill,
can_be_still_num;
NUM_INFO num_info;
EV_NUM_INFO ev_num_info;
public:
field_str(Item* a, analyse* b) :field_info(a,b), min_arg(""),
max_arg(""), sum(0),
must_be_blob(0), was_zero_fill(0),
was_maybe_zerofill(0), can_be_still_num(1)
{ init_tree(&tree, 0, sizeof(String), a->binary ?
(qsort_cmp) stringcmp : (qsort_cmp) sortcmp,
0, (void (*)(void*)) free_string); };
void add();
void get_opt_type(String*, ha_rows);
String *get_min_arg(String *not_used __attribute__((unused)))
{ return &min_arg; }
String *get_max_arg(String *not_used __attribute__((unused)))
{ return &max_arg; }
String *avg(String *s, ha_rows rows)
{
if (!(rows - nulls))
s->set((double) 0.0, 1);
else
s->set((ulonglong2double(sum) / ulonglong2double(rows - nulls)),
DEC_IN_AVG);
return s;
}
friend int collect_string(String *element, element_count count,
TREE_INFO *info);
tree_walk_action collect_enum()
{ return (tree_walk_action) collect_string; }
String *std(String *s __attribute__((unused)),
ha_rows rows __attribute__((unused)))
{ return (String*) 0; }
};
class field_real: public field_info
{
double min_arg, max_arg;
double sum, sum_sqr;
uint max_notzero_dec_len;
public:
field_real(Item* a, analyse* b) :field_info(a,b),
min_arg(0), max_arg(0), sum(0), sum_sqr(0), max_notzero_dec_len(0)
{ init_tree(&tree, 0, sizeof(double),
(qsort_cmp) compare_double, 0, NULL); }
void add();
void get_opt_type(String*, ha_rows);
String *get_min_arg(String *s) { s->set(min_arg, item->decimals); return s; }
String *get_max_arg(String *s) { s->set(max_arg, item->decimals); return s; }
String *avg(String *s, ha_rows rows)
{
if (!(rows - nulls))
s->set((double) 0.0, 1);
else
s->set(((double)sum / (double) (rows - nulls)), item->decimals);
return s;
}
String *std(String *s, ha_rows rows)
{
double tmp = ulonglong2double(rows);
if (!(tmp - nulls))
s->set((double) 0.0, 1);
else
{
double tmp2 = ((sum_sqr - sum * sum / (tmp - nulls)) /
(tmp - nulls));
s->set(((double) tmp2 <= 0.0 ? 0.0 : sqrt(tmp2)), item->decimals);
}
return s;
}
uint decimals() { return item->decimals; }
friend int collect_real(double *element, element_count count,
TREE_INFO *info);
tree_walk_action collect_enum()
{ return (tree_walk_action) collect_real;}
};
class field_longlong: public field_info
{
longlong min_arg, max_arg;
longlong sum, sum_sqr;
public:
field_longlong(Item* a, analyse* b) :field_info(a,b),
min_arg(0), max_arg(0), sum(0), sum_sqr(0)
{ init_tree(&tree, 0, sizeof(longlong),
(qsort_cmp) compare_longlong, 0, NULL); }
void add();
void get_opt_type(String*, ha_rows);
String *get_min_arg(String *s) { s->set(min_arg); return s; }
String *get_max_arg(String *s) { s->set(max_arg); return s; }
String *avg(String *s, ha_rows rows)
{
if (!(rows - nulls))
s->set((double) 0.0, 1);
else
s->set(((double) sum / (double) (rows - nulls)), DEC_IN_AVG);
return s;
}
String *std(String *s, ha_rows rows)
{
double tmp = ulonglong2double(rows);
if (!(tmp - nulls))
s->set((double) 0.0, 1);
else
{
double tmp2 = ((sum_sqr - sum * sum / (tmp - nulls)) /
(tmp - nulls));
s->set(((double) tmp2 <= 0.0 ? 0.0 : sqrt(tmp2)), DEC_IN_AVG);
}
return s;
}
friend int collect_longlong(longlong *element, element_count count,
TREE_INFO *info);
tree_walk_action collect_enum()
{ return (tree_walk_action) collect_longlong;}
};
class field_ulonglong: public field_info
{
ulonglong min_arg, max_arg;
ulonglong sum, sum_sqr;
public:
field_ulonglong(Item* a, analyse * b) :field_info(a,b),
min_arg(0), max_arg(0), sum(0),sum_sqr(0)
{ init_tree(&tree, 0, sizeof(ulonglong),
(qsort_cmp) compare_ulonglong, 0, NULL); }
void add();
void get_opt_type(String*, ha_rows);
String *get_min_arg(String *s) { s->set(min_arg); return s; }
String *get_max_arg(String *s) { s->set(max_arg); return s; }
String *avg(String *s, ha_rows rows)
{
if (!(rows - nulls))
s->set((double) 0.0, 1);
else
s->set((ulonglong2double(sum) / ulonglong2double(rows - nulls)),
DEC_IN_AVG);
return s;
}
String *std(String *s, ha_rows rows)
{
double tmp = ulonglong2double(rows);
if (!(tmp - nulls))
s->set((double) 0.0, 1);
else
{
double tmp2 = ((ulonglong2double(sum_sqr) -
ulonglong2double(sum * sum) / (tmp - nulls)) /
(tmp - nulls));
s->set(((double) tmp2 <= 0.0 ? 0.0 : sqrt(tmp2)), DEC_IN_AVG);
}
return s;
}
friend int collect_ulonglong(ulonglong *element, element_count count,
TREE_INFO *info);
tree_walk_action collect_enum()
{ return (tree_walk_action) collect_ulonglong; }
};
class analyse: public Procedure
{
protected:
Item_proc *func_items[10];
List<Item> fields, result_fields;
field_info **f_info, **f_end;
ha_rows rows;
uint output_str_length;
public:
uint max_tree_elements, max_treemem;
analyse(select_result *res) :Procedure(res, PROC_NO_SORT), rows(0),
output_str_length(0) {}
~analyse()
{
for (field_info **f=f_info; f != f_end; f++)
delete (*f);
}
virtual void add() {}
virtual bool change_columns(List<Item> &fields);
virtual int send_row(List<Item> &fields);
virtual void end_group(void) {}
virtual bool end_of_records(void);
friend Procedure *proc_analyse_init(THD *thd, ORDER *param,
select_result *result,
List<Item> &field_list);
};