Function MayHaveLogicalNulls

cpp/src/arrow/array/data.h:431–446

\brief Return true if the array may have logical nulls Unlike `MayHaveNulls`, this method checks for null child values for types without a validity bitmap, such as unions and run-end encoded types, and for null dictionary values for dictionary types. This implies that `MayHaveLogicalNulls` may return true for arrays that don't have a top-level validity bitmap. It is therefore necessary to call `

  ///       ...
  ///     }
  bool MayHaveLogicalNulls() const {
    if (buffers[0] != NULLPTR) {
      return null_count.load() != 0;
    }
    const auto t = type->id();
    if (t == Type::SPARSE_UNION || t == Type::DENSE_UNION) {
      return internal::UnionMayHaveLogicalNulls(*this);
    }
    if (t == Type::RUN_END_ENCODED) {
      return internal::RunEndEncodedMayHaveLogicalNulls(*this);
    }
    if (t == Type::DICTIONARY) {
      return internal::DictionaryMayHaveLogicalNulls(*this);
    }
    return null_count.load() != 0;
  }

  /// \brief Compute the logical null count for arrays of all types
  ///