Method DoAppendArraySlice

cpp/src/arrow/array/builder_run_end.cc:222–248

template <typename RunEndCType>
Status RunEndEncodedBuilder::DoAppendArraySlice(const ArraySpan& array, int64_t offset,
                                                int64_t length) {
  ARROW_DCHECK(offset + length <= array.length);
  DCHECK_GT(length, 0);
  DCHECK(!value_run_builder_->has_open_run());

  ree_util::RunEndEncodedArraySpan<RunEndCType> ree_span(array, array.offset + offset,
                                                         length);
  const int64_t physical_offset = ree_span.PhysicalIndex(0);
  const int64_t physical_length =
      ree_span.PhysicalIndex(ree_span.length() - 1) + 1 - physical_offset;

  RETURN_NOT_OK(ReservePhysical(physical_length));

  // Append all the run ends from array sliced by offset and length
  for (auto it = ree_span.iterator(0, physical_offset); !it.is_end(ree_span); ++it) {
    const int64_t run_end = committed_logical_length_ + it.run_length();
    RETURN_NOT_OK(DoAppendRunEnd<RunEndCType>(run_end));
    UpdateDimensions(run_end, 0);
  }

  // Append all the values directly
  RETURN_NOT_OK(value_run_builder_->AppendRunCompressedArraySlice(
      ree_util::ValuesArray(array), physical_offset, physical_length));

  return Status::OK();
}

Status RunEndEncodedBuilder::AppendArraySlice(const ArraySpan& array, int64_t offset,
                                              int64_t length) {