Apache Solr: sort by one of fields (with condition)

Question

I want to add sorting by \"field1\" if it\'s exists in document, and by \"field2\" if not. Help me please with query syntax.

Answer 1

As already pointed in this SO question

try to use something like this for int fields :

sort=min(def(A_160018,9000000),def(A_chandigarh1,9000000))

For string fields the option would be to use in the core/collection an extra field containing the concatenation of the fields - e.g. fullname: lastname + ' ' + firstname written explicitly in the document when it is created. Then you can still do sort=fullname asc