thanks for the links, and ... uhh, mad respect on the xwiki CQL feature! :)

a bit tangential, but isn't Solr (and ElasticSearch and probably others) all use Lucerne "indexes" (as in Lucene is a library like LevelDB)?

what's strange is that most JQL that people want would translate to the most boring Hibernate query (or whatever Jira uses for relational DB access)

You are totally right, I thought Solr was a Lucene fork, but it's actually built on top of Lucene, thanks for correcting me. Both are Apache projects.