depends/storage/src/storage/format/orc/orc_proto.proto

/**
 * 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.
 */

syntax = "proto2";

package orc.proto;

option java_package = "org.apache.orc";

message IntegerStatistics {
  optional sint64 minimum = 1;
  optional sint64 maximum = 2;
  optional sint64 sum = 3;
}

message DoubleStatistics {
  optional double minimum = 1;
  optional double maximum = 2;
  optional double sum = 3;
}

message StringStatistics {
  optional string minimum = 1;
  optional string maximum = 2;
  // sum will store the total length of all strings in a stripe
  optional sint64 sum = 3;
}

message BucketStatistics {
  repeated uint64 count = 1 [packed = true];
}

message DecimalStatistics {
  optional string minimum = 1;
  optional string maximum = 2;
  optional string sum = 3;
}

message DateStatistics {
  // min,max values saved as days since epoch
  optional sint32 minimum = 1;
  optional sint32 maximum = 2;
}

message TimestampStatistics {
  // min,max values saved as milliseconds since epoch
  optional sint64 minimum = 1;
  optional sint64 maximum = 2;
  optional sint64 minimumUtc = 3;
  optional sint64 maximumUtc = 4;
}

message BinaryStatistics {
  // sum will store the total binary blob length in a stripe
  optional sint64 sum = 1;
}

message ColumnStatistics {
  optional uint64 numberOfValues = 1;
  optional IntegerStatistics intStatistics = 2;
  optional DoubleStatistics doubleStatistics = 3;
  optional StringStatistics stringStatistics = 4;
  optional BucketStatistics bucketStatistics = 5;
  optional DecimalStatistics decimalStatistics = 6;
  optional DateStatistics dateStatistics = 7;
  optional BinaryStatistics binaryStatistics = 8;
  optional TimestampStatistics timestampStatistics = 9;
  optional bool hasNull = 10;
}

message RowIndexEntry {
  repeated uint64 positions = 1 [packed = true];
  optional ColumnStatistics statistics = 2;
}

message RowIndex {
  repeated RowIndexEntry entry = 1;
}

message BloomFilter {
  optional uint32 numHashFunctions = 1;
  repeated fixed64 bitset = 2;
  optional bytes utf8bitset = 3;
}

message BloomFilterIndex {
  repeated BloomFilter bloomFilter = 1;
}

message Stream {
  // if you add new index stream kinds, you need to make sure to update
  // StreamName to ensure it is added to the stripe in the right area
  enum Kind {
    PRESENT = 0;
    DATA = 1;
    LENGTH = 2;
    DICTIONARY_DATA = 3;
    DICTIONARY_COUNT = 4;
    SECONDARY = 5;
    ROW_INDEX = 6;
    BLOOM_FILTER = 7;
    BLOOM_FILTER_UTF8 = 8;
  }
  optional Kind kind = 1;
  optional uint32 column = 2;
  optional uint64 length = 3;
}

message ColumnEncoding {
  enum Kind {
    DIRECT = 0;
    DICTIONARY = 1;
    DIRECT_V2 = 2;
    DICTIONARY_V2 = 3;
    DIRECT_V0 = 4;
    DICTIONARY_V0 = 5;
  }
  optional Kind kind = 1;
  optional uint32 dictionarySize = 2;

  // The encoding of the bloom filters for this column:
  //   0 or missing = none or original
  //   1            = ORC-135 (utc for timestamps)
  optional uint32 bloomEncoding = 3;
}

message StripeFooter {
  repeated Stream streams = 1;
  repeated ColumnEncoding columns = 2;
  optional string writerTimezone = 3;
}

message Type {
  enum Kind {
    BOOLEAN = 0;
    BYTE = 1;
    SHORT = 2;
    INT = 3;
    LONG = 4;
    FLOAT = 5;
    DOUBLE = 6;
    STRING = 7;
    BINARY = 8;
    TIMESTAMP = 9;
    LIST = 10;
    MAP = 11;
    STRUCT = 12;
    UNION = 13;
    DECIMAL = 14;
    DATE = 15;
    VARCHAR = 16;
    CHAR = 17;
    TIME = 18;
  }
  optional Kind kind = 1;
  repeated uint32 subtypes = 2 [packed = true];
  repeated string fieldNames = 3;
  optional uint32 maximumLength = 4;
  optional uint32 precision = 5;
  optional uint32 scale = 6;
}

message StripeInformation {
  optional uint64 offset = 1;
  optional uint64 indexLength = 2;
  optional uint64 dataLength = 3;
  optional uint64 footerLength = 4;
  optional uint64 numberOfRows = 5;
}

message UserMetadataItem {
  optional string name = 1;
  optional bytes value = 2;
}

message StripeStatistics {
  repeated ColumnStatistics colStats = 1;
}

message Metadata {
  repeated StripeStatistics stripeStats = 1;
}

message Footer {
  optional uint64 headerLength = 1;
  optional uint64 contentLength = 2;
  repeated StripeInformation stripes = 3;
  repeated Type types = 4;
  repeated UserMetadataItem metadata = 5;
  optional uint64 numberOfRows = 6;
  repeated ColumnStatistics statistics = 7;
  optional uint32 rowIndexStride = 8;

  // Each implementation that writes ORC files should register for a code
  // 0 = ORC Java
  // 1 = ORC C++
  // 2 = Presto
  // 3 = Scritchley Go from https://github.com/scritchley/orc
  optional uint32 writer = 9;
}

enum CompressionKind {
  NONE = 0;
  ZLIB = 1;
  SNAPPY = 2;
  LZO = 3;
  LZ4 = 4;
  ZSTD = 5;
}

// Serialized length must be less that 255 bytes
message PostScript {
  optional uint64 footerLength = 1;
  optional CompressionKind compression = 2;
  optional uint64 compressionBlockSize = 3;
  // the version of the file format
  //   [0, 11] = Hive 0.11
  //   [0, 12] = Hive 0.12
  repeated uint32 version = 4 [packed = true];
  optional uint64 metadataLength = 5;

  // The version of the writer that wrote the file. This number is
  // updated when we make fixes or large changes to the writer so that
  // readers can detect whether a given bug is present in the data.
  //
  // Only the Java ORC writer may use values under 6 (or missing) so that
  // readers that predate ORC-202 treat the new writers correctly. Each
  // writer should assign their own sequence of versions starting from 6.
  //
  // Version of the ORC Java writer:
  //   0 = original
  //   1 = HIVE-8732 fixed (fixed stripe/file maximum statistics &
  //                        string statistics use utf8 for min/max)
  //   2 = HIVE-4243 fixed (use real column names from Hive tables)
  //   3 = HIVE-12055 fixed (vectorized writer implementation)
  //   4 = HIVE-13083 fixed (decimals write present stream correctly)
  //   5 = ORC-101 fixed (bloom filters use utf8 consistently)
  //   6 = ORC-135 fixed (timestamp statistics use utc)
  //
  // Version of the ORC C++ writer:
  //   6 = original
  //
  // Version of the Presto writer:
  //   6 = original
  //
  // Version of the Scritchley Go writer:
  //   6 = original
  //
  optional uint32 writerVersion = 6;

  // Leave this last in the record
  optional string magic = 8000;
}

// The contents of the file tail that must be serialized.
// This gets serialized as part of OrcSplit, also used by footer cache.
message FileTail {
  optional PostScript postscript = 1;
  optional Footer footer = 2;
  optional uint64 fileLength = 3;
  optional uint64 postscriptLength = 4;
}