Function serializeDictionaryVector

bolt/serializers/PrestoSerializer.cpp:1934–1960

template <TypeKind Kind>
void serializeDictionaryVector(
    const BaseVector* vector,
    const folly::Range<const IndexRange*>& ranges,
    VectorStream* stream) {
  // Cannot serialize dictionary as PrestoPage dictionary if it has nulls.
  // Also check if the stream was set up for dictionary (we had to know the
  // encoding type when creating VectorStream for that).
  if (vector->nulls() || !stream->isDictionaryStream()) {
    serializeWrapped(vector, ranges, stream);
    return;
  }

  using T = typename KindToFlatVector<Kind>::WrapperType;
  auto dictionaryVector = vector->as<DictionaryVector<T>>();

  std::vector<IndexRange> childRanges;
  childRanges.push_back({0, dictionaryVector->valueVector()->size()});
  serializeColumn(
      dictionaryVector->valueVector().get(), childRanges, stream->childAt(0));

  const BufferPtr& indices = dictionaryVector->indices();
  auto* rawIndices = indices->as<vector_size_t>();
  for (const auto& range : ranges) {
    stream->appendNonNull(range.size);
    stream->append<int32_t>(folly::Range(&rawIndices[range.begin], range.size));
  }
}

template <TypeKind kind>
void serializeConstantVectorImpl(