Inline below...
On Jun 24, 2013, at 07:16 , heikki wrote:
> hello,
>
> I'm a long-time user of Lucene, and have some questions about SOLR.
>
> 1. Is it possible to give actual Lucene queries to SOLR, bypassing any
> SOLR-side QueryParsing ?
No, not directly as Query objects, but Solr's default query parser is lucene
syntax based, so any Lucene QueryParser syntax query can be used in Solr.
Since you've got Lucene API know-how, you could create a custom QParser(Plugin)
easily if you have a different syntax/format that you'd like to use.
> 2. Are there differences in functionality or implementation between Faceted
> Search in Lucene and SOLR ?
They are two entirely different codebases, no overlap whatsoever. I'm sure the
basic results are comparable, but I don't have experience with the Lucene
faceting module so I can't say what's different.
> 3. Is it possible to use several indices (for different languages), and
> sometimes search only in one of them, sometimes (if user requested) search
> in all of them having combined results (and relevancy calculated as if it is
> a single index) ?
Yes. You can create multiple Solr "cores" and query them individually or as if
they were one distributed collection (provided the schemas are compatible).
Regarding relevancy though, there still is an open issue to implement
distributed IDF, so it's not exactly as if it was a single index. With
different languages, you'll be using different fields anyway though, so maybe
the distributed IDF isn't an issue for you.
But you could index all the documents, possibly, into the same index and have a
field that distinguishes the language and filter (or not) to query in any
combination.
Erik
