There's a field "A" I want to facet on. Some documents have no value for field "A". So they wouldn't show up in the list of facet value options.
I want to find a way to let users to find those documents. One way is to make
Null an option the users can choose, something like:
value1 (4558)
value2 (1345)
Null (156)
value3 (85)
Is that something that Solr support?
