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
|
/* Copyright (C) 2003 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef ODBC_CODEGEN_Code_query_distinct_hpp
#define ODBC_CODEGEN_Code_query_distinct_hpp
#include <functional>
#include <common/common.hpp>
#include "Code_query.hpp"
#include "Code_expr_row.hpp"
#include "Code_pred.hpp"
/**
* @class Plan_query_distinct
* @brief Group-by node in PlanTree
*/
class Plan_query_distinct : public Plan_query {
public:
Plan_query_distinct(Plan_root* root);
virtual ~Plan_query_distinct();
Plan_base* analyze(Ctx& ctx, Ctl& ctl);
Exec_base* codegen(Ctx& ctx, Ctl& ctl);
void print(Ctx& ctx);
// children
void setQuery(Plan_query* query);
Plan_expr_row* getRow();
protected:
Plan_query* m_query;
};
inline
Plan_query_distinct::Plan_query_distinct(Plan_root* root) :
Plan_query(root),
m_query(0)
{
}
// children
inline void
Plan_query_distinct::setQuery(Plan_query* query)
{
ctx_assert(query != 0);
m_query = query;
}
/**
* Distinct preserves order of input rows so we use 2 data structures:
* map<row> = index and vector<index> = row (index >= 0).
*/
class Exec_query_distinct;
struct DistinctLess : std::binary_function<const SqlRow*, const SqlRow*, bool> {
bool operator()(const SqlRow* s1, const SqlRow* s2) const;
};
typedef std::map<const SqlRow*, unsigned, DistinctLess> DistinctList;
typedef std::vector<const SqlRow*> DistinctVector;
/**
* @class Exec_query_distinct
* @brief Group-by node in ExecTree
*/
class Exec_query_distinct : public Exec_query {
public:
class Code : public Exec_query::Code {
public:
Code(const SqlSpecs& sqlSpecs);
virtual ~Code();
protected:
friend class Exec_query_distinct;
// sets reference to Sqlspecs from subquery
};
class Data : public Exec_query::Data {
public:
Data(Exec_query_distinct* node, const SqlSpecs& sqlSpecs);
virtual ~Data();
protected:
friend class Exec_query_distinct;
SqlRow m_sqlRow; // current row
bool m_grouped; // fetch and group-by done
unsigned m_count;
DistinctList m_groupList;
DistinctVector m_groupVector;
unsigned m_index;
};
Exec_query_distinct(Exec_root* root);
virtual ~Exec_query_distinct();
void alloc(Ctx& ctx, Ctl& ctl);
void execImpl(Ctx& ctx, Ctl& ctl);
bool fetchImpl(Ctx& ctx, Ctl& ctl);
void close(Ctx& ctx);
void print(Ctx& ctx);
// children
const Code& getCode() const;
Data& getData() const;
void setQuery(Exec_query* query);
const Exec_query* getRawQuery() const;
protected:
friend class Exec_query;
Exec_query* m_query;
};
inline
Exec_query_distinct::Code::Code(const SqlSpecs& sqlSpecs) :
Exec_query::Code(sqlSpecs)
{
}
inline
Exec_query_distinct::Data::Data(Exec_query_distinct* node, const SqlSpecs& sqlSpecs) :
Exec_query::Data(node, m_sqlRow),
m_sqlRow(sqlSpecs),
m_grouped(false),
m_count(0),
m_index(0)
{
}
inline
Exec_query_distinct::Exec_query_distinct(Exec_root* root) :
Exec_query(root),
m_query(0)
{
}
// children
inline const Exec_query_distinct::Code&
Exec_query_distinct::getCode() const
{
const Code* code = static_cast<const Code*>(m_code);
return *code;
}
inline Exec_query_distinct::Data&
Exec_query_distinct::getData() const
{
Data* data = static_cast<Data*>(m_data);
return *data;
}
inline void
Exec_query_distinct::setQuery(Exec_query* query)
{
ctx_assert(m_query == 0 && query != 0);
m_query = query;
}
#endif
|
