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https://issues.apache.org/jira/browse/LUCENE-10130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422042#comment-17422042
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Adrien Grand commented on LUCENE-10130:
---------------------------------------
Looking at the call sites, it looks like we don't need to be able to iterate
over the bits in order. So maybe SparseFixedBitSet is not the right data
structure and we should use a simple hash set instead?
> HnswGraph could make use of a SparseFixedBitSet.getAndSet
> ---------------------------------------------------------
>
> Key: LUCENE-10130
> URL: https://issues.apache.org/jira/browse/LUCENE-10130
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-10130.patch
>
>
> Currently HnswGraph uses SparseFixedBitSet "visited" to track where it has
> already been. The logic currently looks like this:
> {code}
> if (visited.get(entryPoint) == false) {
> visited.set(entryPoint);
> ... logic ...
> }
> {code}
> If SparseFixedBitSet had a {{getAndSet}} (like FixedBitSet), the code could
> be:
> {code}
> if (visited.getAndSet(entrypoint) == false) {
> ... logic ...
> }
> {code}
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