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You shouldn't have to open a new DirectoryReader; instead, use the one you just searched (where you got your ScoreDocs from); use IndexSearcer.getIndexReader to get its reader. The docId from your ScoreDoc is called the "global" docId, which are assigned by concatenating the docIds from each segment (you have 4 segments). If you are just looking up numeric doc values fields, I suggest you use MultiDocValues.getNumericValues; this will return a doc values instance that understand global docIds and you can just look up the value directly. Note that in Lucene 7.0 the DV APIs have switched to iterators. Mike McCandless http://blog.mikemccandless.com On Thu, Jun 22, 2017 at 6:20 PM, Joe Ye <yuanzhou...@gmail.com> wrote: > Thanks a lot Mike! I still don't get any emails from the mailing list :( > > Note that I am new to docValues and tried to google examples to retrieve > docValues from search results but I didn't find much info. I experimented > with the below code using Lucene 6.2.1: > > > > for (ScoreDoc scoreDoc : scoreDocs) { > > Document document = searcher.doc(scoreDoc.doc); > > resultDocs.add(document); > > > > // TODO: get docValues for the doc > > DirectoryReader reader = DirectoryReader.open( > indexWriter.getDirectory()); > > List<LeafReaderContext> readerContexts = > reader.getContext().leaves(); > > for (LeafReaderContext readerContext : readerContexts) { > > LeafReader leafReader = readerContext.reader(); > > NumericDocValues docValues = leafReader. > getNumericDocValues(someDocValueField); > > if (docValues != null) { > > long docValue = docValues.get(scoreDoc.doc); > > } > > } > > } > > > > I have a numeric docValue field. From debugger I can see there are 4 > leaves and hence 4 leafReaders and only the 4th reader seems to get the > correct value for the target docId (and I'm not sure why 4 values here)? > What did I miss/do wrong? Could you point me to the right direction (with > examples) please? > > > Many thanks, > > Joe > > On Tue, Jun 20, 2017 at 12:14 AM, Michael McCandless < > luc...@mikemccandless.com> wrote: > >> In pure Lucene you could just pull the doc values for the docIDs in your >> set of search results; MultiDocValues can be helpful sugar here, unless you >> need SORTED or SORTED_SET in which case it's best to go per-segment. >> >> Or just track down where Solr does this and poach those sources. >> >> Mike McCandless >> >> http://blog.mikemccandless.com >> >> On Mon, Jun 19, 2017 at 11:50 AM, Joe Ye <yuanzhou...@gmail.com> wrote: >> >>> Thanks Mike! My colleague only forwarded Erick's Solr reply today as it >>> seems I didn't get any emails and may have been taken off the mailing list >>> for some reason? >>> >>> We're using Lucene core only (version 6.2.1 at the moment). So there's >>> no link between the docValue and its associated stored field? Is there >>> anything similar/equivalent to useDocValuesAsStored in Lucene core? >>> We're trying to use docValues to avoid a full update (delete + create >>> new)... Yet, we still need to retrieve the updated values. >>> >>> Regards, >>> Joe >>> >>> On Mon, Jun 19, 2017 at 4:16 PM, Michael McCandless < >>> luc...@mikemccandless.com> wrote: >>> >>>> Updating the doc value will not update the stored field (what >>>> document.get returns). If you need to change stored fields you have to use >>>> the IW.updateDocuments API, where the old document is deleted and a new >>>> document is indexed, atomically (to refresh). >>>> >>>> But also see Erick's solr-specific response (to the list) a week ago. >>>> >>>> Mike McCandless >>>> >>>> http://blog.mikemccandless.com >>>> >>>> On Mon, Jun 19, 2017 at 5:41 AM, Joe Ye <yuanzhou...@gmail.com> wrote: >>>> >>>>> Hi, >>>>> >>>>> Could anyone help with my issue described below? If I'm not posting on >>>>> the >>>>> right mailing list please direct me to the correct one. >>>>> >>>>> Many thanks, >>>>> Joe >>>>> >>>>> >>>>> On Mon, Jun 12, 2017 at 3:05 PM, Joe Ye <yuanzhou...@gmail.com> wrote: >>>>> >>>>> > Hi, >>>>> > >>>>> > I have a few NumericDocValuesField fields and also added separate >>>>> > StoredField fields to store the values so that I can access them in >>>>> query >>>>> > results. I used IndexWriter.updateNumericDocValue to update the >>>>> value of >>>>> > a DocValues field. Then I firstly called >>>>> SearcherManager.maybeRefresh to >>>>> > ensure SearcherManager.acquire will return refreshed instances and >>>>> used DocValuesNumbersQuery >>>>> > with the updated value. I did get the matching document in the query >>>>> > result but when I tried to access its value using Document.get, >>>>> it's still >>>>> > the old value. It appears that updating the DocValues field doesn't >>>>> update >>>>> > its associated StoredField value. What do I miss here? >>>>> > >>>>> > >>>>> > I would highly appreciate your help! >>>>> > >>>>> > >>>>> > Regards, >>>>> > >>>>> > Joe >>>>> > >>>>> >>>> >>>> >>> >> >
