// 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.

namespace org.apache.impala.fb;

// Supported compression algorithms. This needs to match the values in
// CatalogObjects.THdfsCompression enum.
enum FbCompression: byte {
  NONE,
  DEFAULT,
  GZIP,
  DEFLATE,
  BZIP2,
  SNAPPY,
  SNAPPY_BLOCKED,
  LZO,
  LZ4,
  ZLIB,
  ZSTD
}

table FbFileBlock {
  // Offset of this block within the file
  // TODO: Remove this field if file blocks are retrieved by offset. Infer offset using
  // the block length.
  offset: long = 0 (id: 0);

  // Total length of the block.
  // TODO: Remove this field and compute the block length using the offsets, block size,
  // and file length.
  length: long = -1 (id: 1);

  // Hosts that contain replicas of this block. Each value in the list is an index to
  // the network_addresses list of THdfsTable. The most significant bit of each
  // replica host index indicates if the replica is cached.
  replica_host_idxs: [ushort] (id: 2);

  // The list of disk ids for the file block. May not be set if disk ids are not
  // supported.
  disk_ids: [ushort] (id: 3);
}

table FbFileDesc {
  // The name of the file (not the full path). The parent path is assumed to be the
  // 'location' of the Partition this file resides within.
  // TODO: Investigate the use of prefix-based compression for file names.
  file_name: string (id: 0);

  // The total length of the file, in bytes.
  length: long (id: 1);

  // The type of compression used for this file.
  // TODO: Check if reordering these fields can produce some space savings by eliminating
  // added padding.
  compression: FbCompression (id: 2);

  // The last modified time of the file.
  last_modification_time: long (id: 3);

  // List of FbFileBlocks that make up this file.
  file_blocks: [FbFileBlock] (id: 4);

  // Whether this file is erasure-coded
  is_ec: bool = false (id: 5);
}