Function firstNonNull

bolt/exec/MergeJoin.cpp:783–801

  }
  return outputSize_ == outputBatchSize_;
}

namespace {
vector_size_t firstNonNull(
    const RowVectorPtr& rowVector,
    const std::vector<column_index_t>& keys,
    vector_size_t start = 0) {
  for (auto i = start; i < rowVector->size(); ++i) {
    bool hasNull = false;
    for (auto key : keys) {
      if (rowVector->childAt(key)->isNullAt(i)) {
        hasNull = true;
        break;
      }
    }
    if (!hasNull) {
      return i;
    }
  }

  return rowVector->size();
}