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https://issues.apache.org/jira/browse/LUCENE-10205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17479157#comment-17479157
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Costin Leau commented on LUCENE-10205:
--------------------------------------
Linking an investigation that used VarHandle on Java 11/17 which overall showed
decreased performance - full details at:
https://github.com/apache/lucene/pull/453
> Should Packed64 use a byte[] plus VarHandles?
> ---------------------------------------------
>
> Key: LUCENE-10205
> URL: https://issues.apache.org/jira/browse/LUCENE-10205
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
>
> By being backed by a long[], Packed64 often has to merge bits coming from two
> different longs. If it was backed by a byte[], it could always read a single
> long, which would help remove conditionals?
> The main downside is that we'd need paging to support high value counts with
> high numbers of bits (when value_count * bits_per_value / 8 >
> ArrayUtil.MAX_ARRAY_LENGTH).
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