We should port the VSO post-search filtering code to work with Fido

[Cadair]

In VSO you can use attrs to filter the search results, we should port this to Fido.

[aribalam]

@Cadair @nabobalis It might be really complicated to filter out queries as the data format varies hugely depending on the client. Moreover there are some issues regarding data returned by the VSOClient (as mentioned in #3833). The QueryResponseBlock list returned is unhashable and cannot be converted to a set which is necessary to remove duplicate queries. The only way I could think of implementing this if every client implements its own way of filtering out data (similar to what is done with attrubute walker). Any suggestions on this?

[nabobalis]

Could we standardize the data format from each client?

[abhijeetmanhas]

After #4011 is merged, I would like to work on it. Specifically we need to have filter for dataretreiver client responses and jsoc responses, similar to vso one. And then implement a search() method in UnifiedResponse which uses existing filters and merge responses from all clients.