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
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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 */
#ifndef FILESORT_INCLUDED
#define FILESORT_INCLUDED
#include "my_base.h" /* ha_rows */
#include "sql_alloc.h"
#include "filesort_utils.h"
class SQL_SELECT;
class THD;
struct TABLE;
class Filesort_tracker;
struct SORT_FIELD;
typedef struct st_order ORDER;
class JOIN;
/**
Sorting related info.
To be extended by another WL to include complete filesort implementation.
*/
class Filesort: public Sql_alloc
{
public:
/** List of expressions to order the table by */
ORDER *order;
/** Number of records to return */
ha_rows limit;
/** ORDER BY list with some precalculated info for filesort */
SORT_FIELD *sortorder;
/** select to use for getting records */
SQL_SELECT *select;
/** TRUE <=> free select on destruction */
bool own_select;
/** true means we are using Priority Queue for order by with limit. */
bool using_pq;
/*
TRUE means sort operation must produce table rowids.
FALSE means that it halso has an option of producing {sort_key,
addon_fields} pairs.
*/
bool sort_positions;
Filesort_tracker *tracker;
Filesort(ORDER *order_arg, ha_rows limit_arg, bool sort_positions_arg,
SQL_SELECT *select_arg):
order(order_arg),
limit(limit_arg),
sortorder(NULL),
select(select_arg),
own_select(false),
using_pq(false),
sort_positions(sort_positions_arg)
{
DBUG_ASSERT(order);
};
~Filesort() { cleanup(); }
/* Prepare ORDER BY list for sorting. */
uint make_sortorder(THD *thd, JOIN *join, table_map first_table_bit);
private:
void cleanup();
};
class SORT_INFO
{
/// Buffer for sorting keys.
Filesort_buffer filesort_buffer;
public:
SORT_INFO()
:addon_field(0), record_pointers(0)
{
buffpek.str= 0;
my_b_clear(&io_cache);
}
~SORT_INFO();
void free_data()
{
close_cached_file(&io_cache);
my_free(record_pointers);
my_free(buffpek.str);
my_free(addon_field);
}
void reset()
{
free_data();
record_pointers= 0;
buffpek.str= 0;
addon_field= 0;
}
IO_CACHE io_cache; /* If sorted through filesort */
LEX_STRING buffpek; /* Buffer for buffpek structures */
LEX_STRING addon_buf; /* Pointer to a buffer if sorted with fields */
struct st_sort_addon_field *addon_field; /* Pointer to the fields info */
/* To unpack back */
void (*unpack)(struct st_sort_addon_field *, uchar *, uchar *);
uchar *record_pointers; /* If sorted in memory */
/*
How many rows in final result.
Also how many rows in record_pointers, if used
*/
ha_rows return_rows;
ha_rows examined_rows; /* How many rows read */
ha_rows found_rows; /* How many rows was accepted */
/** Sort filesort_buffer */
void sort_buffer(Sort_param *param, uint count)
{ filesort_buffer.sort_buffer(param, count); }
/**
Accessors for Filesort_buffer (which @c).
*/
uchar *get_record_buffer(uint idx)
{ return filesort_buffer.get_record_buffer(idx); }
uchar **get_sort_keys()
{ return filesort_buffer.get_sort_keys(); }
uchar **alloc_sort_buffer(uint num_records, uint record_length)
{ return filesort_buffer.alloc_sort_buffer(num_records, record_length); }
void free_sort_buffer()
{ filesort_buffer.free_sort_buffer(); }
void init_record_pointers()
{ filesort_buffer.init_record_pointers(); }
size_t sort_buffer_size() const
{ return filesort_buffer.sort_buffer_size(); }
friend SORT_INFO *filesort(THD *thd, TABLE *table, Filesort *filesort,
Filesort_tracker* tracker, JOIN *join,
table_map first_table_bit);
};
SORT_INFO *filesort(THD *thd, TABLE *table, Filesort *filesort,
Filesort_tracker* tracker, JOIN *join=NULL,
table_map first_table_bit=0);
bool filesort_use_addons(TABLE *table, uint sortlength,
uint *length, uint *fields, uint *null_fields);
void change_double_for_sort(double nr,uchar *to);
#endif /* FILESORT_INCLUDED */
|
