2014-08-22 14:01 GMT+02:00 Emmanuel Bernard <emman...@hibernate.org>:
> > On 22 Aug 2014, at 10:34, Jiri Holusa <jhol...@redhat.com> wrote: > > An alternative which may be a bit simpler and give quicker success for > simplistic queries would be to implement an ES backend of our pluggable > HQL/JP-QL parser. We already have implementations of this which take HQL > queries and translate them into corresponding MongoDB/Neo4j queries, so the > same should be doable for ES. But this wouldn't really carry semantics of > full-text queries (fuzzy search etc.) as one could get it via HSearch and > might expect for a backend such as ES. > > > Hmm, first approach seems to me a better way to do it, but as you said, > HSearch has to be > "undependent" on Lucene first. So I will start with CRUD and see where I > can get. Maybe > after that, something around HSearch and Lucene will be resolved, so than > I could decide > whick approarch to use. > > > Gunnar, the direct HQL->ES-QL work is not as trivial as it seems. I don’t > think ElasticSearch can search on fields that are not explicitly indexed. > (Jiri correct me if I’m wrong). So we would need to guess or anticipate > which field wants to be indexed and how “transparently”. Not the best of > settings. > Interesting, I really need to take a closer look at ES and its APIs. How does it react when searching on an un-indexed field? If we can detect the situation and raise a meaningful exception indicating that an index is missing so a given query can't be run (could even be done during start-up for named queries), then I'd say that's good enough, at least for a first iteration? In particular if we add support for @Index so a user can react. As said that solution would only be a work-around until we can delegate that task to HSearch (which then would have the same challenge probably). Btw. it's the same with Cassandra apparently, you also need to index up-front the columns targeted in queries. --Gunnar _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
