Function is_scalar

cpp/src/arrow/datum.h:269–269

\brief True if Datum contains a scalar

  /// \brief True if Datum contains a scalar
  bool is_scalar() const { return this->kind() == Datum::SCALAR; }

  /// \brief True if Datum contains a scalar or array-like data
  bool is_value() const { return this->is_arraylike() || this->is_scalar(); }