Current File : //usr/include/mysql/server/private/item_row.h
#ifndef ITEM_ROW_INCLUDED
#define ITEM_ROW_INCLUDED
/*
Copyright (c) 2002, 2013, Oracle and/or its affiliates.
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 02110-1335 USA */
/**
Row items used for comparing rows and IN operations on rows:
@verbatim
(a, b, c) > (10, 10, 30)
(a, b, c) = (select c, d, e, from t1 where x=12)
(a, b, c) IN ((1,2,2), (3,4,5), (6,7,8)
(a, b, c) IN (select c, d, e, from t1)
@endverbatim
*/
/**
Item which stores (x,y,...) and ROW(x,y,...).
Note that this can be recursive: ((x,y),(z,t)) is a ROW of ROWs.
*/
class Item_row: public Item,
private Item_args,
private Used_tables_and_const_cache,
private With_subquery_cache
{
table_map not_null_tables_cache;
/**
If elements are made only of constants, of which one or more are
NULL. For example, this item is (1,2,NULL), or ( (1,NULL), (2,3) ).
*/
bool with_null;
public:
Item_row(THD *thd, List<Item> &list):
Item(thd), Item_args(thd, list), not_null_tables_cache(0), with_null(0)
{ }
Item_row(THD *thd, Item_row *row):
Item(thd), Item_args(thd, static_cast<Item_args*>(row)), Used_tables_and_const_cache(),
not_null_tables_cache(0), with_null(0)
{ }
bool with_subquery() const { DBUG_ASSERT(fixed); return m_with_subquery; }
enum Type type() const { return ROW_ITEM; };
const Type_handler *type_handler() const { return &type_handler_row; }
void illegal_method_call(const char *);
bool is_null() { return null_value; }
void make_send_field(THD *thd, Send_field *)
{
illegal_method_call((const char*)"make_send_field");
};
double val_real()
{
illegal_method_call((const char*)"val");
return 0;
};
longlong val_int()
{
illegal_method_call((const char*)"val_int");
return 0;
};
String *val_str(String *)
{
illegal_method_call((const char*)"val_str");
return 0;
};
my_decimal *val_decimal(my_decimal *)
{
illegal_method_call((const char*)"val_decimal");
return 0;
};
bool get_date(MYSQL_TIME *ltime, ulonglong fuzzydate)
{
illegal_method_call((const char*)"get_date");
return true;
}
bool fix_fields(THD *thd, Item **ref);
void fix_after_pullout(st_select_lex *new_parent, Item **ref, bool merge);
void cleanup();
void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array,
List<Item> &fields, uint flags);
table_map used_tables() const { return used_tables_cache; };
bool const_item() const { return const_item_cache; };
void update_used_tables()
{
used_tables_and_const_cache_init();
used_tables_and_const_cache_update_and_join(arg_count, args);
}
table_map not_null_tables() const { return not_null_tables_cache; }
virtual void print(String *str, enum_query_type query_type);
bool walk(Item_processor processor, bool walk_subquery, void *arg)
{
if (walk_args(processor, walk_subquery, arg))
return true;
return (this->*processor)(arg);
}
Item *transform(THD *thd, Item_transformer transformer, uchar *arg);
bool eval_not_null_tables(void *opt_arg);
uint cols() const { return arg_count; }
Item* element_index(uint i) { return args[i]; }
Item** addr(uint i) { return args + i; }
bool check_cols(uint c);
bool null_inside() { return with_null; };
void bring_value();
Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond)
{
Item_args::propagate_equal_fields(thd, Context_identity(), cond);
return this;
}
bool excl_dep_on_table(table_map tab_map)
{
return Item_args::excl_dep_on_table(tab_map);
}
bool excl_dep_on_grouping_fields(st_select_lex *sel)
{
return Item_args::excl_dep_on_grouping_fields(sel);
}
bool check_vcol_func_processor(void *arg) {return FALSE; }
Item *get_copy(THD *thd)
{ return get_item_copy<Item_row>(thd, this); }
Item *build_clone(THD *thd);
};
#endif /* ITEM_ROW_INCLUDED */
Mini Shell