projections.h

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/*
 * 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.
 */
 
#pragma once
 
 
#include <memory>
 
#include "iceberg/iceberg_export.h"
#include "iceberg/result.h"
#include "iceberg/type_fwd.h"
 
namespace iceberg {
 
class ICEBERG_EXPORT ProjectionEvaluator {
 public:
  ~ProjectionEvaluator();
 
  Result<std::shared_ptr<Expression>> Project(const std::shared_ptr<Expression>& expr);
 
 private:
  friend class Projections;
 
  explicit ProjectionEvaluator(std::unique_ptr<class ProjectionVisitor> visitor);
 
  std::unique_ptr<ProjectionVisitor> visitor_;
};
 
struct ICEBERG_EXPORT Projections {
  static std::unique_ptr<ProjectionEvaluator> Inclusive(const PartitionSpec& spec,
                                                        const Schema& schema,
                                                        bool case_sensitive = true);
 
  static std::unique_ptr<ProjectionEvaluator> Strict(const PartitionSpec& spec,
                                                     const Schema& schema,
                                                     bool case_sensitive = true);
};
 
}  // namespace iceberg