# File lib/thinking_sphinx/source/sql.rb, line 117
      def crc_column
        if @model.table_exists? &&
          @model.column_names.include?(@model.inheritance_column)
          
          types = types_to_crcs
          return @model.to_crc32.to_s if types.empty?
          
          adapter.case(adapter.convert_nulls(
            adapter.quote_with_table(@model.inheritance_column)),
            types_to_crcs, @model.to_crc32)
        else
          @model.to_crc32.to_s
        end
      end