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https://issues.apache.org/jira/browse/SOLR-14256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039303#comment-17039303
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Christine Poerschke commented on SOLR-14256:
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Curiosity led me to find unused {{<HashDocSet>}} remnants in {{solrconfig.xml}}
-- SOLR-14267 created for proposed removal.
> Remove HashDocSet
> -----------------
>
> Key: SOLR-14256
> URL: https://issues.apache.org/jira/browse/SOLR-14256
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Reporter: David Smiley
> Priority: Major
>
> This particular DocSet is only used in places where we need to convert
> SortedIntDocSet in particular to a DocSet that is fast for random access.
> Once such a conversion happens, it's only used to test some docs for presence
> and it could be another interface. DocSet has kind of a large-ish API
> surface area to implement. Since we only need to test docs, we could use
> Bits interface (having only 2 methods) backed by an off-the-shelf primitive
> long hash set on our classpath. Perhaps a new method on DocSet: getBits() or
> DocSetUtil.getBits(DocSet).
> In addition to removing complexity unto itself, this improvement is required
> by SOLR-14185 because it wants to be able to produce a DocIdSetIterator slice
> directly from the DocSet but HashDocSet can't do that without sorting first.
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