Code_pred.hpp
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上传日期:2022-05-23
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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_pred_hpp
- #define ODBC_CODEGEN_Code_pred_hpp
- #include <common/common.hpp>
- #include <common/DataField.hpp>
- #include "Code_base.hpp"
- enum Pred_value {
- Pred_value_unknown = -1,
- Pred_value_false = 0,
- Pred_value_true = 1
- };
- class Ctx;
- class Plan_expr_row;
- class Exec_pred;
- /**
- * @class Plan_pred
- * @brief Base class for predicates in PlanTree
- *
- * Predicate represents a boolean value.
- */
- class Plan_pred : public Plan_base {
- public:
- // type is convenient since RTTI cannot be used
- enum Type {
- TypeUndefined = 0,
- TypeComp = 1,
- TypeOp = 2
- };
- Plan_pred(Plan_root* root, Type type);
- virtual ~Plan_pred() = 0;
- Type type() const;
- const TableSet& tableSet() const;
- const TableSet& noInterp() const;
- virtual bool isGroupBy(const Plan_expr_row* row) const;
- // helpers
- Plan_pred* opAnd(Plan_pred* pred2);
- protected:
- const Type m_type;
- TableSet m_tableSet; // depends on these tables
- TableSet m_noInterp; // cannot use interpreted TUP program on these tables
- Exec_pred* m_exec; // probably stupid
- };
- inline
- Plan_pred::Plan_pred(Plan_root* root, Type type) :
- Plan_base(root),
- m_type(type),
- m_exec(0)
- {
- }
- inline Plan_pred::Type
- Plan_pred::type() const
- {
- return m_type;
- }
- inline const Plan_pred::TableSet&
- Plan_pred::tableSet() const
- {
- return m_tableSet;
- }
- inline const Plan_pred::TableSet&
- Plan_pred::noInterp() const
- {
- return m_noInterp;
- }
- /**
- * @class Exec_pred
- * @brief Base class for predicates in ExecTree
- */
- class Exec_pred : public Exec_base {
- public:
- class Code : public Exec_base::Code {
- public:
- Code();
- virtual ~Code() = 0;
- protected:
- friend class Exec_pred;
- };
- class Data : public Exec_base::Data {
- public:
- Data();
- virtual ~Data() = 0;
- Pred_value getValue() const;
- Pred_value groupValue(unsigned i) const;
- protected:
- friend class Exec_pred;
- Pred_value m_value; // the value
- // group-by data
- typedef std::vector<Pred_value> GroupValue;
- GroupValue m_groupValue;
- Pred_value& groupValue(unsigned i, bool initFlag);
- };
- Exec_pred(Exec_root* root);
- virtual ~Exec_pred() = 0;
- virtual void execInterp(Ctx& ctx, Ctl& ctl) = 0;
- virtual void evaluate(Ctx& ctx, Ctl& ctl) = 0;
- // children
- const Code& getCode() const;
- Data& getData() const;
- };
- inline
- Exec_pred::Code::Code()
- {
- }
- inline
- Exec_pred::Data::Data() :
- m_value(Pred_value_unknown)
- {
- }
- inline Pred_value
- Exec_pred::Data::getValue() const
- {
- return m_value;
- }
- inline Pred_value
- Exec_pred::Data::groupValue(unsigned i) const
- {
- ctx_assert(i != 0 && i < m_groupValue.size());
- return m_groupValue[i];
- }
- inline
- Exec_pred::Exec_pred(Exec_root* root) :
- Exec_base(root)
- {
- }
- // children
- inline const Exec_pred::Code&
- Exec_pred::getCode() const
- {
- const Code* code = static_cast<const Code*>(m_code);
- return *code;
- }
- inline Exec_pred::Data&
- Exec_pred::getData() const
- {
- Data* data = static_cast<Data*>(m_data);
- return *data;
- }
- #endif