shark.memstore2.column

CompressionAlgorithm

trait CompressionAlgorithm extends AnyRef

API for Compression

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BooleanBitSetCompression, DictionaryEncoding, IntDeltaEncoding, LongDeltaEncoding, NoCompression, RLE
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Abstract Value Members

  1. abstract def compress[T](b: ByteBuffer, t: ColumnType[T, _]): ByteBuffer

    Compress the given buffer and return the compressed data as a new buffer.

  2. abstract def compressedSize: Int

    Estimation of the data size once compressed.

  3. abstract def compressionType: CompressionType

  4. abstract def gatherStatsForCompressibility[T](v: T, t: ColumnType[T, _]): Unit

    Collect a value so we can update the compression ratio for this compression algorithm.

  5. abstract def supportsType(t: ColumnType[_, _]): Boolean

    Tests whether the compression algorithm supports a specific column type.

  6. abstract def uncompressedSize: Int

    The uncompressed size of the input data.

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  8. def compressionRatio: Double

    Return compression ratio, smaller scores imply higher compressibility.

    Return compression ratio, smaller scores imply higher compressibility. Scores greater than 1.0 indicate that compressed data will take up more space than uncompressed data. This number is used to pick the compression algorithm to apply at runtime.

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