Method run_length

cpp/src/arrow/util/ree_util.h:504–504

\brief returns the logical length of the current run Pre-condition: !is_end()

  ///
  /// Pre-condition: !is_end()
  int64_t run_length() const { return run_end() - logical_pos_; }

  /// \brief Return a physical index into the values array of a given input,
  /// pointing to the value of the current run