Method hashRows

bolt/exec/HashTable.cpp:916–957

template <bool ignoreNullKeys>
bool HashTable<ignoreNullKeys>::hashRows(
    folly::Range<char**> rows,
    bool initNormalizedKeys,
    raw_vector<uint64_t>& hashes) {
  if (rows.empty()) {
    return true;
  }
  if (!initNormalizedKeys && hashMode_ == HashMode::kNormalizedKey) {
    for (auto i = 0; i < rows.size(); ++i) {
      hashes[i] =
          mixNormalizedKey(RowContainer::normalizedKey(rows[i]), sizeBits_);
    }
    return true;
  }

  for (int32_t i = 0; i < hashers_.size(); ++i) {
    auto& hasher = hashers_[i];
    if (hashMode_ == HashMode::kHash) {
      rows_->hash(i, rows, i > 0, hashes.data());
    } else {
      // Array or normalized key.
      auto column = rows_->columnAt(i);
      if (!hasher->computeValueIdsForRows(
              rows.data(),
              rows.size(),
              column.offset(),
              column.nullByte(),
              ignoreNullKeys ? 0 : column.nullMask(),
              hashes)) {
        // Must reconsider 'hashMode_' and start over.
        return false;
      }
    }
  }
  if (hashMode_ == HashMode::kNormalizedKey && initNormalizedKeys) {
    for (auto i = 0; i < rows.size(); ++i) {
      RowContainer::normalizedKey(rows[i]) = hashes[i];
      hashes[i] = mixNormalizedKey(hashes[i], sizeBits_);
    }
  }
  return true;
}

namespace {
template <typename Source>