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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008 Sun Microsystems, Inc.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#ifndef DRIZZLED_FUNCTION_FUNC_H
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#define DRIZZLED_FUNCTION_FUNC_H
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/// TODO: Rename this file - func.h is stupid.
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#include <drizzled/charset_info.h>
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#include <drizzled/current_session.h>
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#include <drizzled/item.h>
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#include <drizzled/item/bin_string.h>
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#include <drizzled/lex_string.h>
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#include <drizzled/sql_list.h>
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#include <drizzled/type/decimal.h>
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#include "drizzled/visibility.h"
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class DRIZZLED_API Item_func :
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public Item_result_field
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Item **args, *tmp_arg[2];
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Allowed numbers of columns in result (usually 1, which means scalar value)
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0 means get this number from first argument
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uint32_t allowed_arg_cols;
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using Item::split_sum_func;
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table_map used_tables_cache, not_null_tables_cache;
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bool const_item_cache;
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enum Functype { UNKNOWN_FUNC,EQ_FUNC,EQUAL_FUNC,NE_FUNC,LT_FUNC,LE_FUNC,
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LIKE_FUNC,ISNULL_FUNC,ISNOTNULL_FUNC,
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COND_AND_FUNC, COND_OR_FUNC, COND_XOR_FUNC,
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BETWEEN, IN_FUNC, MULT_EQUAL_FUNC,
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INTERVAL_FUNC, ISNOTNULLTEST_FUNC,
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NOT_FUNC, NOT_ALL_FUNC,
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NOW_FUNC, TRIG_COND_FUNC,
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SUSERVAR_FUNC, GUSERVAR_FUNC, COLLATE_FUNC,
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EXTRACT_FUNC, CHAR_TYPECAST_FUNC, FUNC_SP,
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enum optimize_type { OPTIMIZE_NONE,OPTIMIZE_KEY,OPTIMIZE_OP, OPTIMIZE_NULL,
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enum Type type() const { return FUNC_ITEM; }
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virtual enum Functype functype() const { return UNKNOWN_FUNC; }
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virtual ~Item_func() {}
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_session(*current_session),
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allowed_arg_cols(1), arg_count(0),
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const_item_cache(false)
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collation.set(DERIVATION_SYSCONST);
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_session(*current_session),
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allowed_arg_cols(1), arg_count(1),
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const_item_cache(false)
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with_sum_func= a->with_sum_func;
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collation.set(DERIVATION_SYSCONST);
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Item_func(Item *a,Item *b):
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_session(*current_session),
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allowed_arg_cols(1), arg_count(2),
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const_item_cache(false)
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args[0]= a; args[1]= b;
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with_sum_func= a->with_sum_func || b->with_sum_func;
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collation.set(DERIVATION_SYSCONST);
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Item_func(Item *a,Item *b,Item *c):
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_session(*current_session),
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const_item_cache(false)
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if ((args= (Item**) memory::sql_alloc(sizeof(Item*)*3)))
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args[0]= a; args[1]= b; args[2]= c;
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with_sum_func= a->with_sum_func || b->with_sum_func || c->with_sum_func;
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collation.set(DERIVATION_SYSCONST);
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Item_func(Item *a,Item *b,Item *c,Item *d):
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_session(*current_session),
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const_item_cache(false)
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if ((args= (Item**) memory::sql_alloc(sizeof(Item*)*4)))
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args[0]= a; args[1]= b; args[2]= c; args[3]= d;
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with_sum_func= a->with_sum_func || b->with_sum_func ||
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c->with_sum_func || d->with_sum_func;
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collation.set(DERIVATION_SYSCONST);
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Item_func(Item *a,Item *b,Item *c,Item *d,Item* e):
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_session(*current_session),
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const_item_cache(false)
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if ((args= (Item**) memory::sql_alloc(sizeof(Item*)*5)))
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args[0]= a; args[1]= b; args[2]= c; args[3]= d; args[4]= e;
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with_sum_func= a->with_sum_func || b->with_sum_func ||
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c->with_sum_func || d->with_sum_func || e->with_sum_func ;
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collation.set(DERIVATION_SYSCONST);
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Item_func(List<Item> &list);
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// Constructor used for Item_cond_and/or (see Item comment)
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Item_func(Session *session, Item_func *item);
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bool fix_fields(Session *, Item **ref);
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void fix_after_pullout(Select_Lex *new_parent, Item **ref);
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table_map used_tables() const;
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table_map not_null_tables() const;
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void update_used_tables();
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bool eq(const Item *item, bool binary_cmp) const;
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virtual optimize_type select_optimize() const { return OPTIMIZE_NONE; }
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virtual bool have_rev_func() const { return 0; }
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virtual Item *key_item() const { return args[0]; }
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This method is used for debug purposes to print the name of an
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item to the debug log. The second use of this method is as
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a helper function of print(), where it is applicable.
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To suit both goals it should return a meaningful,
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distinguishable and sintactically correct string. This method
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should not be used for runtime type identification, use enum
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{Sum}Functype and Item_func::functype()/Item_sum::sum_func()
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virtual const char *func_name() const { return NULL; }
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virtual bool const_item() const { return const_item_cache; }
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Item **arguments() const { return args; }
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void set_arguments(List<Item> &list);
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uint32_t argument_count() const { return arg_count; }
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void remove_arguments() { arg_count=0; }
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* Check if the UDF supports the number of arguments passed in
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* @param number of args
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virtual bool check_argument_count(int) { return true ; }
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virtual void split_sum_func(Session *session, Item **ref_pointer_array,
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virtual void print(String *str, enum_query_type query_type);
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void print_op(String *str, enum_query_type query_type);
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void print_args(String *str, uint32_t from, enum_query_type query_type);
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virtual void fix_num_length_and_dec();
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void count_only_length();
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void count_real_length();
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void count_decimal_length();
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bool get_arg0_date(type::Time <ime, uint32_t fuzzy_date);
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bool get_arg0_time(type::Time <ime);
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virtual bool deterministic() const
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void signal_divide_by_null();
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virtual Field *tmp_table_field() { return result_field; }
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virtual Field *tmp_table_field(Table *t_arg);
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Item *get_tmp_table_item(Session *session);
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type::Decimal *val_decimal(type::Decimal *);
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bool agg_arg_collations(DTCollation &c, Item **items, uint32_t nitems,
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bool agg_arg_collations_for_comparison(DTCollation &c,
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Item **items, uint32_t nitems,
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bool agg_arg_charsets(DTCollation &c, Item **items, uint32_t nitems,
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uint32_t flags, int item_sep);
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bool walk(Item_processor processor, bool walk_subquery, unsigned char *arg);
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Item *transform(Item_transformer transformer, unsigned char *arg);
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Item* compile(Item_analyzer analyzer, unsigned char **arg_p,
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Item_transformer transformer, unsigned char *arg_t);
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void traverse_cond(Cond_traverser traverser,
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void * arg, traverse_order order);
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double fix_result(double value);
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Session &getSession()
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Session *getSessionPtr()
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} /* namespace drizzled */
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#endif /* DRIZZLED_FUNCTION_FUNC_H */