Method AppendNull

cpp/src/arrow/array/builder_nested.h:126–136

  }

  Status AppendNull() final {
    // Append() a null list slot with list_length=0.
    //
    // When building [Large]List arrays, elements being appended to the values builder
    // before the next call to Append* or Finish will extend the list slot length, but
    // that is totally fine because list arrays admit non-empty null list slots.
    //
    // In the case of [Large]ListViews that's not a problem either because the
    // list slot length remains zero.
    return Append(false, 0);
  }

  Status AppendNulls(int64_t length) final {
    ARROW_RETURN_NOT_OK(Reserve(length));