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https://issues.apache.org/jira/browse/LUCENE-9845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302631#comment-17302631
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Michael Sokolov commented on LUCENE-9845:
-----------------------------------------
It does sound tempting to attack the "dense" case, although the main case I
care about is actually the opposite: we have indexes with parent/child
documents, and only the parents have vectors.
> Improve encoding of HNSW graph offsets
> --------------------------------------
>
> Key: LUCENE-9845
> URL: https://issues.apache.org/jira/browse/LUCENE-9845
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Michael Sokolov
> Priority: Major
>
> Today we use a simple {{long[]}} to encode the offset of each document's
> array of neighbors in the HNSW graph. Instead we should use a data structure
> that is optimized for encoding an increasing numeric array, like monotonic
> {{PackedInts}}
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