if operator == "="
      "( #{Issue.table_name}.fixed_version_id IN (" + value.collect { |val| "'#{connection.quote_string(val)}'" }.join(",") + ") )"
    else
      "( #{Issue.table_name}.fixed_version_id NOT IN (" + value.collect { |val| "'#{connection.quote_string(val)}'" }.join(",") + ") OR #{Issue.table_name}.fixed_version_id IS NULL )"