Andy wrote:
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)

Isn't it facet.missing=on?
http://wiki.apache.org/solr/SimpleFacetParameters#facet.missing

Koji

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