superbigcup325/colenc/types

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EncodingError

pub(all) suberror EncodingError {
  Truncated(Int, Int, Int)
  Unsupported(Encoding)
  InvalidCount(Int)
  InvalidBitWidth(Int)
  TypeMismatch(PhysicalType, Encoding)
  Incomplete(Int, Int)
  InvalidIndex(Int, Int)
  InvalidTag(Int)
}

EncodingError::message

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fn EncodingError::message(self : EncodingError) -> String

ColBuf

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pub(all) enum ColBuf {
  Int32s(Array[Int])
  Int64s(Array[Int64])
  Floats(Array[Float])
  Doubles(Array[Double])
  ByteArrays(Array[Bytes])
  Bools(Array[Bool])
}

A flat column of values, one variant per physical type.

ColBuf::physical_type

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fn ColBuf::physical_type(self : ColBuf) -> PhysicalType

ColBuf::value_count

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fn ColBuf::value_count(self : ColBuf) -> Int

DictionaryEncoding

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pub(all) struct DictionaryEncoding {
  dictionary : Bytes
  indices : Bytes
  dictionary_size : Int
  bit_width : Int
}

A dictionary-encoded column: the distinct values as their page payload, the data page payload (bit-width byte plus hybrid indices), and the size and width a reader needs.

Encoding

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pub(all) enum Encoding {
  Plain
  Rle
  Dictionary
  DeltaBinaryPacked
  DeltaLength
  DeltaByteArray
  ByteStreamSplit
  Fsst
}

EncodingStats

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pub(all) struct EncodingStats {
  value_count : Int
  encoded_bytes : Int
}

What an encode reports: how many values went in and how many bytes came out. Compression ratios against the PLAIN baseline are computed from this.

PhysicalType

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pub(all) enum PhysicalType {
  Int32
  Int64
  Float
  Double
  ByteArray
  Bool
}

encoding_name

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fn encoding_name(encoding : Encoding) -> String

physical_type_name

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fn physical_type_name(ty : PhysicalType) -> String

Source Files

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#EncodingError

#EncodingError::message

#ColBuf

#ColBuf::physical_type

#ColBuf::value_count

#DictionaryEncoding

#Encoding

#EncodingStats

#PhysicalType

#encoding_name

#physical_type_name

Source Files

EncodingError

EncodingError::message

ColBuf

ColBuf::physical_type

ColBuf::value_count

DictionaryEncoding

Encoding

EncodingStats

PhysicalType

encoding_name

physical_type_name