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
|
/* -*- 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_TMP_TABLE_PARAM_H
#define DRIZZLED_TMP_TABLE_PARAM_H
/*
Param to create temporary tables when doing SELECT:s
NOTE
This structure is copied using memcpy as a part of JOIN.
*/
class Tmp_Table_Param :public Sql_alloc
{
private:
/* Prevent use of these (not safe because of lists and copy_field) */
Tmp_Table_Param(const Tmp_Table_Param &);
void operator=(Tmp_Table_Param &);
public:
KEY *keyinfo;
List<Item> copy_funcs;
List<Item> save_copy_funcs;
CopyField *copy_field, *copy_field_end;
CopyField *save_copy_field, *save_copy_field_end;
unsigned char *group_buff;
Item **items_to_copy; /* Fields in tmp table */
MI_COLUMNDEF *recinfo,*start_recinfo;
ha_rows end_write_records;
uint32_t field_count;
uint32_t sum_func_count;
uint32_t func_count;
uint32_t hidden_field_count;
uint32_t group_parts,group_length,group_null_parts;
uint32_t quick_group;
bool using_indirect_summary_function;
bool schema_table;
/*
True if GROUP BY and its aggregate functions are already computed
by a table access method (e.g. by loose index scan). In this case
query execution should not perform aggregation and should treat
aggregate functions as normal functions.
*/
bool precomputed_group_by;
bool force_copy_fields;
/* If >0 convert all blob fields to varchar(convert_blob_length) */
uint32_t convert_blob_length;
const CHARSET_INFO *table_charset;
/*
If true, create_tmp_field called from create_tmp_table will convert
all BIT fields to 64-bit longs. This is a workaround the limitation
that MEMORY tables cannot index BIT columns.
*/
bool bit_fields_as_long;
Tmp_Table_Param()
:copy_field(0),
group_parts(0),
group_length(0),
group_null_parts(0),
schema_table(false),
precomputed_group_by(false),
force_copy_fields(false),
convert_blob_length(0),
bit_fields_as_long(false)
{}
~Tmp_Table_Param()
{
cleanup();
}
void init(void);
void cleanup(void);
};
#endif /* DRIZZLED_TMP_TABLE_PARAM_H */
|