In T326912#8576177, @Reedy wrote:

Benefits: with such a parser function, admins would be able to force users to set up a 2FA additional control.

I don't understand how a parserfunction does this?

Thank you, I opened a topic in the MediaWiki Support desk here.

I have updated my patch to work with the latest version of Semantic Drilldown.

Thank you. I did not write formal unit tests, but I am using it in a wiki
family and I see that groups are correct and the sets of results that it
produces through semantic research queries are identical to those given by
SDD. When the code will be more robust I will try to push it in Gerrit and
I will consider your help.

This is a tentative patch for version 2.0.2 that adds a parameter "group" to the filters in order to allow for collecting filters and also an "Export" link that fills a semantic search form (Special :Ask).
I hope that it will be useful and it will be integrated in SD.