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#13339 PR: Add a MemorySegment Vector scorer - for scoring without copying on-heap
4 hours ago  86 comments  0 votes  0 watches  ChrisHegarty, benwtrent, msokolov, uschindler
Add a MemorySegment Vector scorer - for scoring without copying on-heap. The vector scorer loads values directly from the backing memory segment when available. Otherwise, if the vector data spans across segments, or is a query vector, the scorer copies the ...
    ChrisHegarty 7.9 hours ago:  Ok. Done.
    ChrisHegarty 3.4 days ago:  > Backporting would only require that you may need to duplicate versions for 19, 20, 21+. 19 has no ... If it hurts too much (to get this on JDK 20) then we'll limit it to JDK 21+. :-)

#13362 PR: Add sub query explanations in DisjunctionMaxQuery#explain on no-match
4.3 hours ago  0 comments  0 votes  0 watches  timgrein
# Closes https://github.com/apache/lucene/issues/13357 Description https://github.com/apache/ ... Considering that other queries like CoveringQuery also include explanations, if the document didn't ... Also added tests for explain (match and no match case).

#12627: HnwsGraph creates disconnected components
8.8 hours ago  37 comments  0 votes  0 watches  CloudMarc, angadp, benwtrent, msokolov, nitirajrathore, xwt1
Description I work for Amazon Retail Product search and we are using Lucene KNN for semantic ... We recently noticed that the hnsw graphs generated are not always strongly connected and in worst ... Connectedness of Hierarchical graph can be complicated, so below I am mentioning my experiment ...
    xwt1 8.9 hours ago:  > Hi @benwtrent, > > I left Amazon but I was able to run some tests with open dataset and also ... I cannot share whole lot of detail about Amazon dataset but some aggregated results are shown. Rest assured I am picking this issue on priority now
    CloudMarc 5.2 days ago:  One might hypothesize that this issue is due to adapting HNWS to Lucene's approach to segmentation. ... This seems undercut by these observations: https://github.com/apache/lucene/issues/12627issuecommen ... If it's significantly more, that may indicate an implementation defect.

#13361 PR: Fix TestHnswByteVectorGraph.testSortedAndUnsortedIndicesReturnSameResults
11.7 hours ago  0 comments  0 votes  0 watches  timgrein
# Closes https://github.com/apache/lucene/issues/13210 # Description The following test failed ... Increasing k from 60 to 80 fixes the test.

#13359 PR: Use IndexInput#prefetch for terms dictionary lookups.
22.7 hours ago  3 comments  0 votes  0 watches  jpountz, rmuir
This introduces TermsEnum#prepareSeekExact, which essentially calls IndexInput#prefetch at the ... Then it takes advantage of the fact that BooleanQuery already calls Weight#scorerSupplier on all ... So TermQuery now calls TermsEnum#prepareSeekExact on Weight#scorerSupplier (if scores are not ...
    rmuir 22.7 hours ago:  I really don't like these calls to seek() just to prefetch data. Since it is just prefetching, I'd prefer if this "dance" was an impl detail, if needed. It would make the code simpler to just pass parameter to prefetch rather than do this.
    jpountz 1.5 days ago:  This is a draft as I need to do more work on tests and making sure that this new method cannot ... <details> <summary>But I created a benchmark that starts looking like running a Lucene query that ... It creates an index with many terms that have very short postings lists, so that running boolean ...

#13327 PR: Reduce memory usage of field maps in FieldInfos and BlockTree TermsReader.
1.1 days ago  35 comments  0 votes  0 watches  bruno-roustant, dsmiley, jpountz
Description Two goals: 1- Reduce the memory usage of field maps when there are many fields. FieldInfos construtor is refactored to build the byNumber array in a more efficient way, avoiding ... Use a primitive IntObjectHashMap to reduce the memory usage compared to an HashMap in ...
    dsmiley 1.2 days ago:  Don't even need to copy it as we've given ourselves permission to take ownership of the input array ...
    dsmiley 1.2 days ago:  If fieldNumberStrictlyAscending, and we've given ourselves permission to accept the input array, we ...

#13360 PR: Call ArrayUtil.copyOf instead of ArrayUtil.copySubArray for full array copy.
1.2 days ago  1 comments  0 votes  0 watches  bruno-roustant, dsmiley
ArrayUtil provides copySubArray() as replacement of Array.copyOf and Array.copyOfRange (with better ... Unfortunately ArrayUtil does not provide copyArray(), so it is weird for callers to have to call a ... This PR adds ArrayUtil.copyArray(), and replaces the calls to ArrayUtil.copySubArray(array, 0, ...

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