query_optimizer/physical/Join.hpp

/**
 *   Copyright 2011-2015 Quickstep Technologies LLC.
 *   Copyright 2015 Pivotal Software, Inc.
 *
 *   Licensed 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_PHYSICAL_JOIN_HPP_
#define QUICKSTEP_QUERY_OPTIMIZER_PHYSICAL_JOIN_HPP_

#include <memory>
#include <vector>

#include "query_optimizer/expressions/AttributeReference.hpp"
#include "query_optimizer/expressions/ExpressionUtil.hpp"
#include "query_optimizer/expressions/NamedExpression.hpp"
#include "query_optimizer/physical/Physical.hpp"
#include "utility/Macros.hpp"

namespace quickstep {
namespace optimizer {
namespace physical {

/** \addtogroup OptimizerPhysical
 *  @{
 */

class Join;
typedef std::shared_ptr<const Join> JoinPtr;

/**
 * @brief Base class for physical join nodes.
 */
class Join : public Physical {
 public:
  /**
   * @brief Destructor.
   */
  ~Join() override {}

  /**
   * @brief Gets the project expressions.
   *
   * @return The list of project expressions.
   */
  const std::vector<expressions::NamedExpressionPtr>& project_expressions() const {
    return project_expressions_;
  }

  std::vector<expressions::AttributeReferencePtr> getOutputAttributes() const override {
    return expressions::ToRefVector(project_expressions_);
  }

 protected:
  /**
   * @brief Constructor.
   *
   * @param project_expressions The project expressions.
   */
  explicit Join(
      const std::vector<expressions::NamedExpressionPtr>& project_expressions)
      : project_expressions_(project_expressions) {}

 private:
  std::vector<expressions::NamedExpressionPtr> project_expressions_;

  DISALLOW_COPY_AND_ASSIGN(Join);
};

/** @} */

}  // namespace physical
}  // namespace optimizer
}  // namespace quickstep

#endif /* QUICKSTEP_QUERY_OPTIMIZER_PHYSICAL_JOIN_HPP_ */