summaryrefslogtreecommitdiffstats
path: root/sql/item_row.h
blob: fbf632ba3b764095fe307bdf033601d0d1cafc09 (plain)
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
153
154
155
156
#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 *get_copy(THD *thd) override
  { return get_item_copy<Item_row>(thd, this); }
  Item *build_clone(THD *thd) override;
};

#endif /* ITEM_ROW_INCLUDED */