According to the current processing mode, retrieval report is not a necessary condition for filing a case, but if there is no retrieval report, the court will stop the case and ask the plaintiff to issue such a retrieval report as an auxiliary means to prove the validity of the patent.
Generally, it takes two months from the application to the retrieval of the report, and the cost is 2400. As long as you apply, you can get it, but the conclusion is not necessarily what you want.
Now, if you meet the same product in Taobao or Tmall. If you want to sue them or ask them to take off the shelf, you should also provide the customer service with a patent search report.