Method values_remaining

cpp/src/arrow/util/rle_encoding_internal.h:837–840

  constexpr size_type values_read() const noexcept { return values_read_; }

  constexpr size_type values_remaining() const noexcept {
    ARROW_DCHECK_LE(values_read_, values_count_);
    return values_count_ - values_read_;
  }

  constexpr void AccrueReadValues(size_type to_read) noexcept {
    ARROW_DCHECK_LE(to_read, values_remaining());