message: Update DataFrame.h
  Removed unnecessary vector cleanups in DataFrame::~DataFrame
diff: @@ -90,9 +90,6 @@ public:
  DataFrame &operator= (DataFrame &&) = default;
  ~DataFrame() {
  - column_list_.clear();
  - column_tb_.clear();
  - indices_.clear();
  const SpinGuard guard(lock_);
  data_.clear();
  };
  