code: def _row_selector(self, other):
          
          if type(other) is SArray:
              if self.__has_size__() and other.__has_size__() and len(other) != len(self):
                  raise IndexError("Cannot perform logical indexing on arrays of different length.")
              with cython_context():
                  return SFrame(_proxy=self.__proxy__.logical_filter(other.__proxy__))
docs: Where other is an SArray of identical length as the current Frame,
          this returns a selection of a subset of rows in the current SFrame
          where the corresponding row in the selector is non-zero.