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From zuyu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #237: QUICKSTEP-89 Add support for common s...
Date Mon, 24 Apr 2017 00:16:14 GMT
Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/237#discussion_r112847625
  
    --- Diff: query_optimizer/expressions/CommonSubexpression.hpp ---
    @@ -0,0 +1,141 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *   http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing,
    + * software distributed under the License is distributed on an
    + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    + * KIND, either express or implied.  See the License for the
    + * specific language governing permissions and limitations
    + * under the License.
    + **/
    +
    +#ifndef QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_COMMON_SUBEXPRESSION_HPP_
    +#define QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_COMMON_SUBEXPRESSION_HPP_
    +
    +#include <memory>
    +#include <string>
    +#include <unordered_map>
    +#include <vector>
    +
    +#include "query_optimizer/expressions/AttributeReference.hpp"
    +#include "query_optimizer/expressions/ExprId.hpp"
    +#include "query_optimizer/expressions/Expression.hpp"
    +#include "query_optimizer/expressions/ExpressionType.hpp"
    +#include "query_optimizer/expressions/Scalar.hpp"
    +#include "utility/Macros.hpp"
    +
    +#include "glog/logging.h"
    +
    +namespace quickstep {
    +
    +class Scalar;
    +class Type;
    +
    +namespace optimizer {
    +namespace expressions {
    +
    +/** \addtogroup OptimizerExpressions
    + *  @{
    + */
    +
    +class CommonSubexpression;
    +typedef std::shared_ptr<const CommonSubexpression> CommonSubexpressionPtr;
    +
    +/**
    + * @brief A wrapper expression that represents a common subexpression.
    + */
    +class CommonSubexpression : public Scalar {
    + public:
    +  ExpressionType getExpressionType() const override {
    +    return ExpressionType::kCommonSubexpression;
    +  }
    +
    +  std::string getName() const override {
    +    return "CommonSubexpression";
    +  }
    +
    +  bool isConstant() const override {
    +    return operand_->isConstant();
    +  }
    +
    +  /**
    +   * @return The unique ID for the equivalence class that this common subexpression
    +   *         belongs to.
    +   */
    +  inline ExprId common_subexpression_id() const {
    +    return common_subexpression_id_;
    +  }
    +
    +  /**
    +   * @return The operand that represents the underlying subexpression.
    +   */
    +  const ScalarPtr& operand() const {
    +    return operand_;
    +  }
    +
    +  const Type& getValueType() const override {
    +    return operand_->getValueType();
    +  }
    +
    +  ExpressionPtr copyWithNewChildren(
    +      const std::vector<ExpressionPtr> &new_children) const override;
    +
    +  std::vector<AttributeReferencePtr> getReferencedAttributes() const override {
    +    return operand_->getReferencedAttributes();
    +  }
    +
    +  ::quickstep::Scalar* concretize(
    +      const std::unordered_map<ExprId, const CatalogAttribute*> &substitution_map)
const override;
    +
    +  /**
    +   * @brief Creates an immutable CommonSubexpression.
    +   *
    +   * @param common_subexpression_id A unique ID for the equivalence class that
    +   *        this common subexpressions belongs to.
    +   * @param operand The operand that represents the underlying subexpression.
    +   * @return An immutable CommonSubexpression.
    +   */
    +  static CommonSubexpressionPtr Create(const ExprId common_subexpression_id,
    +                                       const ScalarPtr &operand) {
    +    return CommonSubexpressionPtr(
    +        new CommonSubexpression(common_subexpression_id, operand));
    +  }
    +
    + protected:
    +  void getFieldStringItems(
    +      std::vector<std::string> *inline_field_names,
    +      std::vector<std::string> *inline_field_values,
    +      std::vector<std::string> *non_container_child_field_names,
    +      std::vector<OptimizerTreeBaseNodePtr> *non_container_child_fields,
    +      std::vector<std::string> *container_child_field_names,
    +      std::vector<std::vector<OptimizerTreeBaseNodePtr>> *container_child_fields)
const override;
    +
    + private:
    +  CommonSubexpression(const ExprId common_subexpression_id,
    +                      const ScalarPtr &operand)
    +      : common_subexpression_id_(common_subexpression_id),
    +        operand_(operand) {
    +    addChild(operand);
    +  }
    +
    +  ExprId common_subexpression_id_;
    +  ScalarPtr operand_;
    --- End diff --
    
    Mark both `const`.


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