history_table.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 <cstdint>
#include <memory>
 
#include "iceberg/arrow_c_data.h"
#include "iceberg/iceberg_export.h"
#include "iceberg/inspect/metadata_scan.h"
#include "iceberg/inspect/metadata_table.h"
#include "iceberg/result.h"
#include "iceberg/type_fwd.h"
 
namespace iceberg {
 
class ICEBERG_EXPORT HistoryTable : public MetadataTable {
 public:
  static Result<std::unique_ptr<HistoryTable>> Make(std::shared_ptr<const Table> table);
 
  static const std::shared_ptr<Schema>& CanonicalSchema();
 
  ~HistoryTable() override;
 
  MetadataTableKind kind() const noexcept override { return MetadataTableKind::kHistory; }
 
  const std::shared_ptr<Schema>& schema() const override;
 
 protected:
  Result<std::unique_ptr<MetadataScan>> MakeScan(
      internal::MetadataScanContext context) const override;
 
 private:
  friend class MetadataScanTaskReader;
 
  static Result<ArrowArrayStream> ReadRows(
      std::shared_ptr<const TableMetadata> metadata,
      const std::shared_ptr<Schema>& projected_schema, int64_t batch_size);
 
  explicit HistoryTable(std::shared_ptr<const Table> table);
};
 
class ICEBERG_EXPORT HistoryScan final : public MetadataScan {
 public:
  static Result<std::unique_ptr<HistoryScan>> Make(internal::MetadataScanContext context);
 
  ~HistoryScan() override;
 
  Result<MetadataScanTaskStreamPtr> PlanTasksStream() const override;
 
 private:
  HistoryScan(internal::MetadataScanContext context,
              std::shared_ptr<MetadataScanTask> task);
 
  const std::shared_ptr<MetadataScanTask> task_;
};
 
}  // namespace iceberg