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https://issues.apache.org/jira/browse/SOLR-114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466160
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Hoss Man commented on SOLR-114:
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quick questions...
1) what test did you run to get those numbers? ... even if we don't commit it,
we should attach it to this Jira issue
2) we should probably test at least the Sun 1.5 JVM as well right?
> HashDocSet new hash(), andNot(), union()
> ----------------------------------------
>
> Key: SOLR-114
> URL: https://issues.apache.org/jira/browse/SOLR-114
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: Yonik Seeley
> Attachments: hashdocset.patch
>
>
> Looking at the negative filters stuff, I realized that andNot() had no
> optimized implementation for HashDocSet, so I implemented that and union().
> While I was in there, I did a re-analysis of hash collision rates and came up
> with a cool new hash method that goes directly into a linear scan and is
> hence simpler, faster, and has fewer collisions.
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