Method nulls

bolt/vector/DecodedVector.cpp:433–468

}

const uint64_t* DecodedVector::nulls(const SelectivityVector* rows) {
  if (allNulls_.has_value()) {
    return allNulls_.value();
  }

  if (hasExtraNulls_) {
    allNulls_ = nulls_;
  } else if (!nulls_ || size_ == 0) {
    allNulls_ = nullptr;
  } else {
    if (isIdentityMapping_) {
      allNulls_ = nulls_;
    } else if (isConstantMapping_) {
      copiedNulls_.resize(0);
      copiedNulls_.resize(bits::nwords(size_), bits::kNull64);
      allNulls_ = copiedNulls_.data();
    } else {
      // Copy base nulls.
      copiedNulls_.resize(bits::nwords(size_));
      auto* rawCopiedNulls = copiedNulls_.data();
      if (rows != nullptr) {
        // Partial consistency check: The end may be less than the decode time
        // end but not greater.
        BOLT_CHECK_LE(rows->end(), size_);
      }
      auto baseSize = baseVector_->size();
      applyToRows(rows, [&](auto i) {
        BOLT_DCHECK_LT(indices_[i], baseSize);
        bits::setNull(rawCopiedNulls, i, bits::isBitNull(nulls_, indices_[i]));
      });
      allNulls_ = copiedNulls_.data();
    }
  }

  return allNulls_.value();
}

template <typename Func>
void DecodedVector::applyToRows(const SelectivityVector* rows, Func&& func)