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https://issues.apache.org/jira/browse/LUCENE-9845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17302146#comment-17302146
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Michael Sokolov commented on LUCENE-9845:
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So, {{IndexedDISI}} would work OK if it provided a random access API. Graph
search tends to fetch values from all over the place, and it's not great to
continually reset the iterator or create a new one when you need to "go
backwards." I actually played around with extending IndexedDISI with random
access way back at the beginning of this HNSW patch:
https://issues.apache.org/jira/browse/LUCENE-9051, but dropped that idea in
the midst of just trying to get the basic feature working. Maybe we should
revisit that idea?
> 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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