Method extractGroupsInRowFormat

bolt/exec/GroupingSet.cpp:814–843

#endif
  const int32_t numGroups = table_
      ? table_->rows()->listRows(
            &iterator, maxOutputRows, maxOutputBytes, groups)
      : 0;
  if (numGroups == 0) {
    if (table_ != nullptr) {
      table_->clear();
    }
    return false;
  }
  if (supportRowBasedOutput_) {
    extractGroupsInRowFormat(folly::Range<char**>(groups, numGroups), result);
  } else {
    extractGroups(folly::Range<char**>(groups, numGroups), result);
  }
  return true;
}

void GroupingSet::extractGroupsInRowFormat(
    folly::Range<char**> groups,
    RowVectorPtr& result) {
  BOLT_DCHECK(!sortedAggregations_ && isPartial_ && rowInfo_.has_value());
  NanosecondTimer timer(&stats_.aggExtractGroupsTimeNs);
  if (groups.empty()) {
    return;
  }
  result->resize(groups.size());
  // 4 bytes for rowSize
  static constexpr int32_t headerSize = sizeof(RowSizeType);
  const auto& rowInfo = rowInfo_.value();
  char *rowStart = nullptr, *newRow = nullptr;
  RowSizeType rowSize = 0, actualRowSize = 0;
  const auto& compositeResult =
      std::dynamic_pointer_cast<CompositeRowVector>(result);