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/* 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_group_hpp
#define ODBC_CODEGEN_Code_query_group_hpp
#include <functional>
#include <common/common.hpp>
#include "Code_query.hpp"
#include "Code_expr_row.hpp"
#include "Code_pred.hpp"
/**
* @class Plan_query_group
* @brief Group-by node in PlanTree
*/
class Plan_query_group : public Plan_query {
public:
Plan_query_group(Plan_root* root);
virtual ~Plan_query_group();
Plan_base* analyze(Ctx& ctx, Ctl& ctl);
Exec_base* codegen(Ctx& ctx, Ctl& ctl);
void print(Ctx& ctx);
// children
void setQuery(Plan_query* query);
void setDataRow(Plan_expr_row* dataRow);
void setGroupRow(Plan_expr_row* groupRow);
void setHavingPred(Plan_pred* havingPred);
Plan_expr_row* getRow();
protected:
Plan_query* m_query;
Plan_expr_row* m_dataRow;
Plan_expr_row* m_groupRow;
Plan_pred* m_havingPred;
};
inline
Plan_query_group::Plan_query_group(Plan_root* root) :
Plan_query(root),
m_query(0),
m_dataRow(0),
m_groupRow(0),
m_havingPred(0)
{
}
// children
inline void
Plan_query_group::setQuery(Plan_query* query)
{
ctx_assert(query != 0);
m_query = query;
}
inline void
Plan_query_group::setDataRow(Plan_expr_row* dataRow)
{
ctx_assert(dataRow != 0);
m_dataRow = dataRow;
}
inline void
Plan_query_group::setGroupRow(Plan_expr_row* groupRow)
{
ctx_assert(groupRow != 0);
m_groupRow = groupRow;
}
inline void
Plan_query_group::setHavingPred(Plan_pred* havingPred)
{
ctx_assert(havingPred != 0);
m_havingPred = havingPred;
}
/**
* Group-by uses a std::map. Key is values grouped by. Data is unique index
* (starting at 1) into arrays in expression data.
*/
class Exec_query_group;
struct GroupLess : std::binary_function<const SqlRow*, const SqlRow*, bool> {
bool operator()(const SqlRow* s1, const SqlRow* s2) const;
};
typedef std::map<const SqlRow*, unsigned, GroupLess> GroupList;
/**
* @class Exec_query_group
* @brief Group-by node in ExecTree
*/
class Exec_query_group : public Exec_query {
public:
class Code : public Exec_query::Code {
public:
Code(const SqlSpecs& sqlSpecs);
virtual ~Code();
protected:
friend class Exec_query_group;
// sets reference to Sqlspecs from subquery
};
class Data : public Exec_query::Data {
public:
Data(Exec_query_group* node, const SqlSpecs& sqlSpecs);
virtual ~Data();
protected:
friend class Exec_query_group;
SqlRow m_sqlRow; // current row
bool m_grouped; // fetch and group-by done
unsigned m_count;
GroupList m_groupList;
GroupList::iterator m_iterator;
};
Exec_query_group(Exec_root* root);
virtual ~Exec_query_group();
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);
void setDataRow(Exec_expr_row* dataRow);
void setGroupRow(Exec_expr_row* groupRow);
void setHavingPred(Exec_pred* havingPred);
const Exec_query* getRawQuery() const;
protected:
friend class Exec_query;
Exec_query* m_query;
Exec_expr_row* m_dataRow;
Exec_expr_row* m_groupRow;
Exec_pred* m_havingPred;
};
inline
Exec_query_group::Code::Code(const SqlSpecs& sqlSpecs) :
Exec_query::Code(sqlSpecs)
{
}
inline
Exec_query_group::Data::Data(Exec_query_group* node, const SqlSpecs& sqlSpecs) :
Exec_query::Data(node, m_sqlRow),
m_sqlRow(sqlSpecs),
m_grouped(false),
m_count(0)
{
}
inline
Exec_query_group::Exec_query_group(Exec_root* root) :
Exec_query(root),
m_query(0),
m_dataRow(0),
m_groupRow(0),
m_havingPred(0)
{
}
// children
inline const Exec_query_group::Code&
Exec_query_group::getCode() const
{
const Code* code = static_cast<const Code*>(m_code);
return *code;
}
inline Exec_query_group::Data&
Exec_query_group::getData() const
{
Data* data = static_cast<Data*>(m_data);
return *data;
}
inline void
Exec_query_group::setQuery(Exec_query* query)
{
ctx_assert(m_query == 0 && query != 0);
m_query = query;
}
inline void
Exec_query_group::setDataRow(Exec_expr_row* dataRow)
{
ctx_assert(m_dataRow == 0 && dataRow != 0);
m_dataRow = dataRow;
}
inline void
Exec_query_group::setGroupRow(Exec_expr_row* groupRow)
{
ctx_assert(m_groupRow == 0 && groupRow != 0);
m_groupRow = groupRow;
}
inline void
Exec_query_group::setHavingPred(Exec_pred* havingPred)
{
ctx_assert(m_havingPred == 0 && havingPred != 0);
m_havingPred = havingPred;
}
#endif
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