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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_expr_column_hpp
#define ODBC_CODEGEN_Code_expr_column_hpp
#include <common/common.hpp>
#include "Code_column.hpp"
#include "Code_expr.hpp"
class DictColumn;
class Plan_table;
/**
* @class Plan_expr_column
* @brief Column in query expression
*/
class Plan_expr_column : public Plan_expr, public Plan_column {
public:
Plan_expr_column(Plan_root* root, const BaseString& name);
virtual ~Plan_expr_column();
Plan_base* analyze(Ctx& ctx, Ctl& ctl);
Exec_base* codegen(Ctx& ctx, Ctl& ctl);
bool resolveEq(Ctx& ctx, Plan_expr* expr);
void print(Ctx& ctx);
bool isEqual(const Plan_expr* expr) const;
bool isGroupBy(const Plan_expr_row* row) const;
};
inline
Plan_expr_column::Plan_expr_column(Plan_root* root, const BaseString& name) :
Plan_expr(root, TypeColumn),
Plan_column(Type_expr, name)
{
}
/**
* @class Exec_expr_column
* @brief Column in query expression
*/
class Exec_expr_column : public Exec_expr {
public:
class Code : public Exec_expr::Code {
public:
Code(const SqlSpec& sqlSpec, unsigned resOff);
virtual ~Code();
protected:
friend class Exec_expr_column;
SqlSpec m_sqlSpec;
unsigned m_resOff;
};
class Data : public Exec_expr::Data {
public:
Data(SqlField& sqlField);
virtual ~Data();
protected:
friend class Exec_expr_column;
// set reference to SqlField in query
};
Exec_expr_column(Exec_root* root);
virtual ~Exec_expr_column();
void alloc(Ctx& ctx, Ctl& ctl);
void evaluate(Ctx& ctx, Ctl& ctl);
void close(Ctx& ctx);
void print(Ctx& ctx);
// children
const Code& getCode() const;
Data& getData() const;
};
inline
Exec_expr_column::Code::Code(const SqlSpec& sqlSpec, unsigned resOff) :
Exec_expr::Code(m_sqlSpec),
m_sqlSpec(sqlSpec),
m_resOff(resOff)
{
}
inline
Exec_expr_column::Data::Data(SqlField& sqlField) :
Exec_expr::Data(sqlField)
{
}
inline
Exec_expr_column::Exec_expr_column(Exec_root* root) :
Exec_expr(root)
{
}
// children
inline const Exec_expr_column::Code&
Exec_expr_column::getCode() const
{
const Code* code = static_cast<const Code*>(m_code);
return *code;
}
inline Exec_expr_column::Data&
Exec_expr_column::getData() const
{
Data* data = static_cast<Data*>(m_data);
return *data;
}
#endif
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