code: def _read_dictionary_page(file_obj, schema_helper, page_header, column_metadata):
      
      raw_bytes = _read_page(file_obj, page_header, column_metadata)
      io_obj = io.BytesIO(raw_bytes)
      values = encoding.read_plain(
          io_obj,
          column_metadata.type,
          page_header.dictionary_page_header.num_values
      )
      # convert the values once, if the dictionary is associated with a converted_type.
      schema_element = schema_helper.schema_element(column_metadata.path_in_schema[-1])
      return convert_column(values, schema_element) if schema_element.converted_type is not None else values
docs: Read a page containing dictionary data.
  
      Consumes data using the plain encoding and returns an array of values.