1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
*
* 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_ITEM_REF_H
#define DRIZZLED_ITEM_REF_H
class Item_ref :public Item_ident
{
protected:
void set_properties();
public:
enum Ref_Type { REF, DIRECT_REF, OUTER_REF };
Field *result_field; /* Save result here */
Item **ref;
Item_ref(Name_resolution_context *context_arg,
const char *db_arg, const char *table_name_arg,
const char *field_name_arg)
:Item_ident(context_arg, db_arg, table_name_arg, field_name_arg),
result_field(0), ref(0) {}
/*
This constructor is used in two scenarios:
A) *item = NULL
No initialization is performed, fix_fields() call will be necessary.
B) *item points to an Item this Item_ref will refer to. This is
used for GROUP BY. fix_fields() will not be called in this case,
so we call set_properties to make this item "fixed". set_properties
performs a subset of action Item_ref::fix_fields does, and this subset
is enough for Item_ref's used in GROUP BY.
TODO we probably fix a superset of problems like in BUG#6658. Check this
with Bar, and if we have a more broader set of problems like this.
*/
Item_ref(Name_resolution_context *context_arg, Item **item,
const char *table_name_arg, const char *field_name_arg,
bool alias_name_used_arg= false);
/* Constructor need to process subselect with temporary tables (see Item) */
Item_ref(Session *session, Item_ref *item)
:Item_ident(session, item), result_field(item->result_field), ref(item->ref) {}
enum Type type() const { return REF_ITEM; }
bool eq(const Item *item, bool binary_cmp) const
{
Item *it= ((Item *) item)->real_item();
return ref && (*ref)->eq(it, binary_cmp);
}
double val_real();
int64_t val_int();
my_decimal *val_decimal(my_decimal *);
bool val_bool();
String *val_str(String* tmp);
bool is_null();
bool get_date(DRIZZLE_TIME *ltime,uint32_t fuzzydate);
double val_result();
int64_t val_int_result();
String *str_result(String* tmp);
my_decimal *val_decimal_result(my_decimal *);
bool val_bool_result();
bool send(Protocol *prot, String *tmp);
void make_field(Send_field *field);
bool fix_fields(Session *, Item **);
void fix_after_pullout(Select_Lex *new_parent, Item **ref);
int save_in_field(Field *field, bool no_conversions);
void save_org_in_field(Field *field);
enum Item_result result_type () const { return (*ref)->result_type(); }
enum_field_types field_type() const { return (*ref)->field_type(); }
Field *get_tmp_table_field()
{ return result_field ? result_field : (*ref)->get_tmp_table_field(); }
Item *get_tmp_table_item(Session *session);
table_map used_tables() const
{
return depended_from ? OUTER_REF_TABLE_BIT : (*ref)->used_tables();
}
void update_used_tables()
{
if (!depended_from)
(*ref)->update_used_tables();
}
table_map not_null_tables() const { return (*ref)->not_null_tables(); }
void set_result_field(Field *field) { result_field= field; }
bool is_result_field() { return 1; }
void save_in_result_field(bool no_conversions)
{
(*ref)->save_in_field(result_field, no_conversions);
}
Item *real_item(void)
{
return ref ? (*ref)->real_item() : this;
}
const Item *real_item(void) const
{
return ref ? (*ref)->real_item() : this;
}
bool walk(Item_processor processor, bool walk_subquery, unsigned char *arg)
{ return (*ref)->walk(processor, walk_subquery, arg); }
virtual void print(String *str, enum_query_type query_type);
bool result_as_int64_t()
{
return (*ref)->result_as_int64_t();
}
void cleanup();
Item_field *filed_for_view_update()
{ return (*ref)->filed_for_view_update(); }
virtual Ref_Type ref_type() { return REF; }
// Row emulation: forwarding of ROW-related calls to ref
uint32_t cols()
{
return ref && result_type() == ROW_RESULT ? (*ref)->cols() : 1;
}
Item* element_index(uint32_t i)
{
return ref && result_type() == ROW_RESULT ? (*ref)->element_index(i) : this;
}
Item** addr(uint32_t i)
{
return ref && result_type() == ROW_RESULT ? (*ref)->addr(i) : 0;
}
bool check_cols(uint32_t c)
{
return ref && result_type() == ROW_RESULT ? (*ref)->check_cols(c)
: Item::check_cols(c);
}
bool null_inside()
{
return ref && result_type() == ROW_RESULT ? (*ref)->null_inside() : 0;
}
void bring_value()
{
if (ref && result_type() == ROW_RESULT)
(*ref)->bring_value();
}
};
#endif /* DRIZZLED_ITEM_REF_H */
|