Hi all,
I seem to be lost in the new flex indexing api. In the older api I
was able to extend QueryComponent with my custom component, parse a
restricted-syntax user query into a SpanQuery, and then grab an
IndexReader. From there I worked with the spanquery's spans. For a bit
of reference my old QueryComponent code looks something like:
@Override
public void process(ResponseBuilder rb) throws IOException {
SolrQueryRequest req = rb.req;
SolrQueryResponse rsp = rb.rsp;
SDRQParser qparser = (SDRQParser) rb.getQparser();
SolrIndexSearcher.QueryCommand cmd = rb.getQueryCommand();
// custom parser returns SpanQuery
IndexReader reader = req.getSearcher().getReader();
Spans spans = stq.getSpans(reader);
// work with spans here...
}
With the new (1.5?) api, I got the warning about wrapping
IndexReader with SlowMultiReaderWrapper, so I changed my approach above
to something like:
SolrIndexReader fullReader = req.getSearcher().getReader();
IndexReader reader = SlowMultiReaderWrapper.wrap(fullReader);
// need help avoiding this...?
I then got a NPE on what seems to be EmptyTerms.toString(). For
kicks, I noticed that EmpytyTerms did not override its parent
(TermSpans) toString() method, which seemed to be the cause of the
problems. Overriding that, fixed the NPE, and now I get results (so I
will look at filing a bug report unless someone mentions otherwise).
Any hints on how I can/should 'properly' work with spans in solr?
Also, are there any introductory documents to the MultiFields and
sub-indexes stuff? Particularly how to implement MultiFields as a better
approach to SlowMultiReaderWrapper (thanks for the warnings about
performance). I cannot seem to find the relevant beginner material to
avoid using the SMRW. The material I do find seems to require that you
pass in a 'found' document, or perhaps walk through all subReaders?
And finally: should I be looking at some existing Solr code to lead
guide me? I am having trouble finding the highlighter code which I
believe uses spans (WeightedSpanTerm??). Is there already code to
convert user queries to span queries?
Thanks,
Sean
