Package org.apache.arrow.algorithm.dictionary

Interface DictionaryEncoder<E extends BaseIntVector,D extends ValueVector>

Type Parameters:
E - type of the encoded vector.
D - type of the vector to encode. It is also the type of the dictionary vector.
All Known Implementing Classes:
HashTableDictionaryEncoder, LinearDictionaryEncoder, SearchDictionaryEncoder
public interface DictionaryEncoder<E extends BaseIntVector,D extends ValueVector>
A dictionary encoder translates one vector into another one based on a dictionary vector. According to Arrow specification, the encoded vector must be an integer based vector, which is the index of the original vector element in the dictionary.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    encode(D input, E output)
    Translates an input vector into an output vector.

  • Method Details

    • encode

      void encode(D input, E output)
      Translates an input vector into an output vector.
      Parameters:
      input - the input vector.
      output - the output vector. Note that it must be in a fresh state. At least, all its validity bits should be clear.