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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_const_hpp
+#define ODBC_CODEGEN_Code_expr_const_hpp
+
+#include <common/common.hpp>
+#include <common/DataField.hpp>
+#include "Code_expr.hpp"
+
+/**
+ * @class Plan_expr_const
+ * @brief Constant expression value in PlanTree
+ */
+class Plan_expr_const : public Plan_expr {
+public:
+ Plan_expr_const(Plan_root* root, LexType lexType, const char* value);
+ virtual ~Plan_expr_const();
+ Plan_base* analyze(Ctx& ctx, Ctl& ctl);
+ Exec_base* codegen(Ctx& ctx, Ctl& ctl);
+ void print(Ctx& ctx);
+ bool isEqual(const Plan_expr* expr) const;
+ bool isGroupBy(const Plan_expr_row* row) const;
+protected:
+ // lexical type and token set by the parser
+ LexType m_lexType;
+ BaseString m_string;
+};
+
+inline
+Plan_expr_const::Plan_expr_const(Plan_root* root, LexType lexType, const char* value) :
+ Plan_expr(root, TypeConst),
+ m_lexType(lexType),
+ m_string(value)
+{
+}
+
+/**
+ * @class Exec_expr_const
+ * @brief Constant expression value in ExecTree
+ */
+class Exec_expr_const : public Exec_expr {
+public:
+ class Code : public Exec_expr::Code {
+ public:
+ Code(const SqlField& sqlField);
+ virtual ~Code();
+ protected:
+ friend class Exec_expr_const;
+ const SqlField m_sqlField;
+ };
+ class Data : public Exec_expr::Data {
+ public:
+ Data(SqlField& sqlField);
+ virtual ~Data();
+ protected:
+ friend class Exec_expr_const;
+ SqlField m_sqlField;
+ };
+ Exec_expr_const(Exec_root* root);
+ virtual ~Exec_expr_const();
+ 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_const::Code::Code(const SqlField& sqlField) :
+ Exec_expr::Code(m_sqlField.sqlSpec()),
+ m_sqlField(sqlField)
+{
+}
+
+inline
+Exec_expr_const::Data::Data(SqlField& sqlField) :
+ Exec_expr::Data(m_sqlField),
+ m_sqlField(sqlField)
+{
+}
+
+inline
+Exec_expr_const::Exec_expr_const(Exec_root* root) :
+ Exec_expr(root)
+{
+}
+
+// children
+
+inline const Exec_expr_const::Code&
+Exec_expr_const::getCode() const
+{
+ const Code* code = static_cast<const Code*>(m_code);
+ return *code;
+}
+
+inline Exec_expr_const::Data&
+Exec_expr_const::getData() const
+{
+ Data* data = static_cast<Data*>(m_data);
+ return *data;
+}
+
+#endif