Function LogicalDenseUnionNullCount

cpp/src/arrow/util/union_util.cc:43–56

}

int64_t LogicalDenseUnionNullCount(const ArraySpan& span) {
  const auto* dense_union_type = internal::checked_cast<const DenseUnionType*>(span.type);
  DCHECK_LE(span.child_data.size(), 128);

  const int8_t* types = span.GetValues<int8_t>(1);      // NOLINT
  const int32_t* offsets = span.GetValues<int32_t>(2);  // NOLINT
  int64_t null_count = 0;
  for (int64_t i = 0; i < span.length; i++) {
    const int8_t child_id = dense_union_type->child_ids()[types[span.offset + i]];
    const int32_t offset = offsets[span.offset + i];
    null_count += span.child_data[child_id].IsNull(offset);
  }
  return null_count;
}

}  // namespace arrow::union_util