Function isReusableEncoding

bolt/vector/BaseVector.cpp:846–851

  auto avgRowSize = 1.0 * leaf->retainedSize() / leaf->size();
  return length_ * avgRowSize;
}

namespace {
bool isReusableEncoding(VectorEncoding::Simple encoding) {
  return encoding == VectorEncoding::Simple::FLAT ||
      encoding == VectorEncoding::Simple::ARRAY ||
      encoding == VectorEncoding::Simple::MAP ||
      encoding == VectorEncoding::Simple::ROW;
}