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https://issues.apache.org/jira/browse/LUCENE-10408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17497367#comment-17497367
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ASF subversion and git services commented on LUCENE-10408:
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Commit 44d7d962ae42cfca7070a8e2c84ab059fec21e10 in lucene's branch
refs/heads/main from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=44d7d96 ]
LUCENE-10408: Write doc IDs of KNN vectors as ints rather than vints. (#708)
Since doc IDs with a vector are loaded as an int[] in memory, this changes the
on-disk format of vectors to align with the in-memory representation by using
ints instead of vints to represent doc IDs. This might make vectors a bit
larger on disk, but also a bit faster to open.
I made the same change to how we encode nodes on levels for the same reason.
> Better dense encoding of doc Ids in Lucene91HnswVectorsFormat
> -------------------------------------------------------------
>
> Key: LUCENE-10408
> URL: https://issues.apache.org/jira/browse/LUCENE-10408
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mayya Sharipova
> Assignee: Mayya Sharipova
> Priority: Minor
> Fix For: 9.1
>
> Time Spent: 5.5h
> Remaining Estimate: 0h
>
> Currently we write doc Ids of all documents that have vectors as is. We
> should improve their encoding either using delta encoding or bitset.
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