# File lib/thinking_sphinx/source/sql.rb, line 62
      def sql_select_clause(offset)
        unique_id_expr = ThinkingSphinx.unique_id_expression(offset)

        (
          ["#{@model.quoted_table_name}.#{quote_column(@model.primary_key_for_sphinx)} #{unique_id_expr} AS #{quote_column(@model.primary_key_for_sphinx)} "] + 
          @fields.collect     { |field|     field.to_select_sql     } +
          @attributes.collect { |attribute| attribute.to_select_sql }
        ).compact.join(", ")
      end