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_fixed_hybrid,
private Item_args,
private Used_tables_and_const_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_fixed_hybrid(thd), Item_args(thd, list),
not_null_tables_cache(0), with_null(0)
{ }
Item_row(THD *thd, Item_row *row)
:Item_fixed_hybrid(thd), Item_args(thd, static_cast<Item_args*>(row)),
Used_tables_and_const_cache(),
not_null_tables_cache(0), with_null(0)
{ }
enum Type type() const override { return ROW_ITEM; };
const Type_handler *type_handler() const override { return &type_handler_row; }
Field *create_tmp_field_ex(MEM_ROOT *root, TABLE *table, Tmp_field_src *src,
const Tmp_field_param *param) override
{
return NULL; // Check with Vicentiu why it's called for Item_row
}
void illegal_method_call(const char *);
bool is_null() override { return null_value; }
void make_send_field(THD *thd, Send_field *) override
{
illegal_method_call((const char*)"make_send_field");
};
double val_real() override
{
illegal_method_call((const char*)"val");
return 0;
};
longlong val_int() override
{
illegal_method_call((const char*)"val_int");
return 0;
};
String *val_str(String *) override
{
illegal_method_call((const char*)"val_str");
return 0;
};
my_decimal *val_decimal(my_decimal *) override
{
illegal_method_call((const char*)"val_decimal");
return 0;
};
bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override
{
illegal_method_call((const char*)"get_date");
return true;
}
bool fix_fields(THD *thd, Item **ref) override;
void fix_after_pullout(st_select_lex *new_parent, Item **ref, bool merge)
override;
void cleanup() override;
void split_sum_func(THD *thd, Ref_ptr_array ref_pointer_array,
List<Item> &fields, uint flags) override;
table_map used_tables() const override { return used_tables_cache; };
bool const_item() const override { return const_item_cache; };
void update_used_tables() override
{
used_tables_and_const_cache_init();
used_tables_and_const_cache_update_and_join(arg_count, args);
}
table_map not_null_tables() const override { return not_null_tables_cache; }
void print(String *str, enum_query_type query_type) override;
bool walk(Item_processor processor, bool walk_subquery, void *arg) override
{
if (walk_args(processor, walk_subquery, arg))
return true;
return (this->*processor)(arg);
}
Item *transform(THD *thd, Item_transformer transformer, uchar *arg) override;
bool eval_not_null_tables(void *opt_arg) override;
bool find_not_null_fields(table_map allowed) override;
uint cols() const override { return arg_count; }
Item* element_index(uint i) override { return args[i]; }
Item** addr(uint i) override { return args + i; }
bool check_cols(uint c) override;
bool null_inside() override { return with_null; };
void bring_value() override;
Item* propagate_equal_fields(THD *thd, const Context &ctx, COND_EQUAL *cond)
override
{
Item_args::propagate_equal_fields(thd, Context_identity(), cond);
return this;
}
bool excl_dep_on_table(table_map tab_map) override
{
return Item_args::excl_dep_on_table(tab_map);
}
bool excl_dep_on_grouping_fields(st_select_lex *sel) override
{
return Item_args::excl_dep_on_grouping_fields(sel);
}
bool excl_dep_on_in_subq_left_part(Item_in_subselect *subq_pred) override
{
return Item_args::excl_dep_on_in_subq_left_part(subq_pred);
}
bool check_vcol_func_processor(void *arg) override {return FALSE; }
Item *do_get_copy(THD *thd) const override
{ return get_item_copy<Item_row>(thd, this); }
Item *do_build_clone(THD *thd) const override;
};
#endif /* ITEM_ROW_INCLUDED */
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