text: // 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
  
  namespace arrow {
  
  template <typename T>
  class Future;
  
  class TimestampParser;
  
  namespace internal {
  
  class Executor;
  class TaskGroup;
  class ThreadPool;
  
  }  // namespace internal
  
  struct Compression {
    /// \brief Compression algorithm
    enum type {
      UNCOMPRESSED,
      SNAPPY,
      GZIP,
      BROTLI,
      ZSTD,
      LZ4,
      LZ4_FRAME,
      LZO,
      BZ2,
      LZ4_HADOOP
    };
  };
  
  namespace util {
  class Compressor;
  class Decompressor;
  class Codec;
  }  // namespace util
  
  }  // namespace arrow
  