# File lib/thinking_sphinx/field.rb, line 71
    def to_select_sql
      return nil unless available?
      
      clause = columns_with_prefixes.join(', ')
      
      clause = adapter.concatenate(clause)       if concat_ws?
      clause = adapter.group_concatenate(clause) if is_many?
      
      "#{clause} AS #{quote_column(unique_name)}"
    end