Confirming the Need for Result Filter Plug-in

Philip explains Timothy when to use a Result Filter (RF) plug-in. He says that RF plug-in is needed in one of the following situations:

1. There is a requirement for secure searching, but no ACLs are available during indexing. All security must be applied on a
   row-by-row basis at the time of hitlist generation. This has more implications when security granularity is high. If the user has access to half the documents in the system, then on an average SES has to examine 20 hits to give a hitlist of 10 results. On the other hand, if the user has access to only 1% of the documents, SES would have to examine 1000 hits for the same result.
   
   
2. Though ACLs are available at indexing time, it is important to check the security information at query time, as there are chances of access being removed from a document since it was last indexed.