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#16677: [ENH] Improve DocValues bulk decoding using Panama Vector API
3 hours ago  2 comments  0 votes  0 watches  CH-Abhinav, KHARSHAVARDHAN-eng
Description Currently, when Lucene decodes byte-aligned DocValues (specifically 8-bit, 16-bit, and ... Using Panama Vector API , we can process these conversions in bulk using in built vector casts ( ... Possible solution In PanamaDocValuesBulkDecodeSupport we should add vectorized decoding of Byte, ...
    CH-Abhinav 3 hours ago:  Uhh I would like anyone to work on this issue but this issue is about DocValues and PanamaDocValuesB ... I guess your AI hallucinates. Anyways I already have code logic with me regarding this issue.
    KHARSHAVARDHAN-eng 5.4 hours ago:  Hi, I’d like to work on this issue. I’ll investigate the current centroid calculation implementation for the OSQ vector format, ... I’ll also add or update the relevant tests and benchmarks.

#16520 PR: Support two-phase filters in MaxScoreBulkScorer bitset path
7.9 hours ago  4 comments  0 votes  0 watches  github-actions[bot], kkewwei, romseygeek
Description Related https://github.com/apache/lucene/pull/16515discussion_r3803396045 <!-- If this is your first contribution to Lucene, please make sure you have reviewed the ... https://github.com/apache/lucene/blob/main/CONTRIBUTING.md -->
    kkewwei 12.9 days ago:  Thanks for the review. I updated the test following by testDenseScorersUseBitSet, so it now specifically verifies that ...
    romseygeek 13 days ago:  I don't think this is actually testing that we're calling intoBitSet on the TwoPhaseIterator?

#16678 PR: Backport "Fix the COSINE merge scorer in Lucene104ScalarQuantizedVectorsReader" to 10.5.2
7.9 hours ago  1 comments  0 votes  0 watches  github-actions[bot], john-mlika, kaivalnp
Description Backport of 16665 to branch_10_5. The fix has already been backported to branch_10x in https://github.com/apache/lucene/commit/ ... A test in the fix depends on Lucene99HnswVectorsReadergetFlatVectorsReader, which is **not** ...
    john-mlika 9.4 hours ago:  the test doesn't need the function on any of the branches. Lucene99HnswVectorsReader already implements QuantizedVectorsReader, so we can cast the reader ...

#16664 PR: Speed up concurrent HNSW merge through reduced beam insertion
12.5 hours ago  2 comments  0 votes  0 watches  costin, github-actions[bot], mayya-sharipova
When merging HNSW graphs concurrently, every non-base vector is inserted via full beam search from ... The sequential merge path avoids this, by collecting neighborhood information as entry points to ... This PR addressed that.
    costin 12.5 hours ago:  Thanks for the review. This is going to be a long answer as my understanding of the algorithm might be incomplete hence ... Now threads "steal" leftover work as (source graph, source ordinal) and look up the merged ordinal ...
    mayya-sharipova 4.7 days ago:  @costin Thanks for tackling concurrent merges. Before you invest more here: I'm not convinced by this approach. The sequential algorithm was designed around the join set, which gives two guarantees — coverage ...

#16671 PR: Backport "Backwards-compatibility changes for [Byte|Float]VectorSimilarityQuery" to branch_10x
13.2 hours ago  0 comments  0 votes  0 watches  github-actions[bot], kaivalnp
Backport #16654 to branch_10x

#16478 PR: Reject LZ4 match offsets that point before the start of the output
14.1 hours ago  7 comments  0 votes  0 watches  github-actions[bot], jpountz, rmuir, serhiy-bzhezytskyy, uschindler
Description LZ4decompress reads a match offset and checks only that it is not zero. It does not check it against the number of bytes written so far, so an offset larger than dOff ... System.arraycopy(dest, dOff - matchDec, dest, dOff, fastLen); // same ` Corrupt input therefore ...
    uschindler 14.1 hours ago:  Please don't rebase, we want to see the changes done in PRs, so just merge (see the button in the ... When we merge the PR it gets splashed anyways.
    uschindler 14.2 hours ago:  Hi, I think IOException is correct here, because all the othr code throws this. Changing that to CorruptIndexException would need more refactoring and should be a separate PR. I don't think this is relevant here.

#16672: Umbra-style strings for Lucene
14.6 hours ago  1 comments  0 votes  0 watches  rmuir, stefanvodita
Description I was reading the Umbra DB paper and they describe an approach to storing strings ( ... They use 16 bytes. Short strings fit in the 16 bytes.
    rmuir 14.6 hours ago:  isn't the point of these optimizations usually to try to inline small strings into stack space? does it apply to java?

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