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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* 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
*/
#ifndef DRIZZLED_FUNCTION_FUNC_H
#define DRIZZLED_FUNCTION_FUNC_H
/// TODO: Rename this file - func.h is stupid.
#include <drizzled/item.h>
#include <drizzled/sql_list.h>
#include <drizzled/item/bin_string.h>
#include "drizzled/current_session.h"
namespace drizzled
{
class Item_func :public Item_result_field
{
Session &_session;
protected:
Item **args, *tmp_arg[2];
/*
Allowed numbers of columns in result (usually 1, which means scalar value)
0 means get this number from first argument
*/
uint32_t allowed_arg_cols;
public:
using Item::split_sum_func;
uint32_t arg_count;
table_map used_tables_cache, not_null_tables_cache;
bool const_item_cache;
enum Functype { UNKNOWN_FUNC,EQ_FUNC,EQUAL_FUNC,NE_FUNC,LT_FUNC,LE_FUNC,
GE_FUNC,GT_FUNC,
LIKE_FUNC,ISNULL_FUNC,ISNOTNULL_FUNC,
COND_AND_FUNC, COND_OR_FUNC, COND_XOR_FUNC,
BETWEEN, IN_FUNC, MULT_EQUAL_FUNC,
INTERVAL_FUNC, ISNOTNULLTEST_FUNC,
NOT_FUNC, NOT_ALL_FUNC,
NOW_FUNC, TRIG_COND_FUNC,
SUSERVAR_FUNC, GUSERVAR_FUNC, COLLATE_FUNC,
EXTRACT_FUNC, CHAR_TYPECAST_FUNC, FUNC_SP,
NEG_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; }
virtual ~Item_func() {}
Item_func(void):
_session(*current_session),
allowed_arg_cols(1), arg_count(0)
{
with_sum_func= 0;
collation.set(DERIVATION_SYSCONST);
}
Item_func(Item *a):
_session(*current_session),
allowed_arg_cols(1), arg_count(1)
{
args= tmp_arg;
args[0]= a;
with_sum_func= a->with_sum_func;
collation.set(DERIVATION_SYSCONST);
}
Item_func(Item *a,Item *b):
_session(*current_session),
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;
collation.set(DERIVATION_SYSCONST);
}
Item_func(Item *a,Item *b,Item *c):
_session(*current_session),
allowed_arg_cols(1)
{
arg_count= 0;
if ((args= (Item**) memory::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;
}
collation.set(DERIVATION_SYSCONST);
}
Item_func(Item *a,Item *b,Item *c,Item *d):
_session(*current_session),
allowed_arg_cols(1)
{
arg_count= 0;
if ((args= (Item**) memory::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;
}
collation.set(DERIVATION_SYSCONST);
}
Item_func(Item *a,Item *b,Item *c,Item *d,Item* e):
_session(*current_session),
allowed_arg_cols(1)
{
arg_count= 5;
if ((args= (Item**) memory::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 ;
}
collation.set(DERIVATION_SYSCONST);
}
Item_func(List<Item> &list);
// Constructor used for Item_cond_and/or (see Item comment)
Item_func(Session *session, Item_func *item);
bool fix_fields(Session *, Item **ref);
void fix_after_pullout(Select_Lex *new_parent, Item **ref);
table_map used_tables() const;
table_map not_null_tables() const;
void update_used_tables();
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]; }
/*
This method is used for debug purposes to print the name of an
item to the debug log. The second use of this method is as
a helper function of print(), where it is applicable.
To suit both goals it should return a meaningful,
distinguishable and sintactically correct string. This method
should not be used for runtime type identification, use enum
{Sum}Functype and Item_func::functype()/Item_sum::sum_func()
instead.
*/
virtual const char *func_name() const { return NULL; }
virtual bool const_item() const { return const_item_cache; }
Item **arguments() const { return args; }
void set_arguments(List<Item> &list);
uint32_t argument_count() const { return arg_count; }
void remove_arguments() { arg_count=0; }
/**
* Check if the UDF supports the number of arguments passed in
* @param number of args
*/
virtual bool check_argument_count(int) { return true ; }
virtual void split_sum_func(Session *session, Item **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, uint32_t from, enum_query_type query_type);
virtual void fix_num_length_and_dec();
void count_only_length();
void count_real_length();
void count_decimal_length();
bool get_arg0_date(DRIZZLE_TIME *ltime, uint32_t fuzzy_date);
bool get_arg0_time(DRIZZLE_TIME *ltime);
bool is_null();
void signal_divide_by_null();
virtual Field *tmp_table_field() { return result_field; }
virtual Field *tmp_table_field(Table *t_arg);
Item *get_tmp_table_item(Session *session);
my_decimal *val_decimal(my_decimal *);
bool agg_arg_collations(DTCollation &c, Item **items, uint32_t nitems,
uint32_t flags);
bool agg_arg_collations_for_comparison(DTCollation &c,
Item **items, uint32_t nitems,
uint32_t flags);
bool agg_arg_charsets(DTCollation &c, Item **items, uint32_t nitems,
uint32_t flags, int item_sep);
bool walk(Item_processor processor, bool walk_subquery, unsigned char *arg);
Item *transform(Item_transformer transformer, unsigned char *arg);
Item* compile(Item_analyzer analyzer, unsigned char **arg_p,
Item_transformer transformer, unsigned char *arg_t);
void traverse_cond(Cond_traverser traverser,
void * arg, traverse_order order);
double fix_result(double value);
Session &getSession()
{
return _session;
}
Session *getSessionPtr()
{
return &_session;
}
};
} /* namespace drizzled */
#endif /* DRIZZLED_FUNCTION_FUNC_H */
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