orc.proto

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;
}

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 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;
}

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

message RowIndex {
  repeated RowIndexEntry entry = 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;
  }
  required 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;
  }
  required Kind kind = 1;
  optional uint32 dictionarySize = 2;
}

message StripeFooter {
  repeated Stream streams = 1;
  repeated ColumnEncoding columns = 2;
}

message FieldType {
  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;
  }
  required Kind kind = 1;
  repeated uint32 subtypes = 2 [packed=true];
  repeated string fieldNames = 3;
}

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

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

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

enum CompressionKind {
  NONE = 0;
  ZLIB = 1;
  SNAPPY = 2;
  LZO = 3;
}

// Serialized length must be less that 255 bytes
message PostScript {
  optional uint64 footerLength = 1;
  optional CompressionKind compression = 2;
  optional uint64 compressionBlockSize = 3;
  repeated uint32 version = 4 [packed = true];
  // Leave this last in the record
  optional string magic = 8000;
}