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https://issues.apache.org/jira/browse/SOLR-6581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14233029#comment-14233029
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Joel Bernstein commented on SOLR-6581:
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The latest patch includes changes for both the CollapsingQParserPlugin and the
ExpandComponent.
This is somewhat of interesting ticket as it involved exploring the tradeoffs
of using the new Lucene DocValues class versus the UninvertedReader class which
can be used to hook into the FieldCache. I'll update the description of this
ticket with the details.
> Prepare CollapsingQParserPlugin and ExpandComponent for 5.0
> -----------------------------------------------------------
>
> Key: SOLR-6581
> URL: https://issues.apache.org/jira/browse/SOLR-6581
> Project: Solr
> Issue Type: Bug
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 5.0
>
> Attachments: SOLR-6581.patch, SOLR-6581.patch
>
>
> There were changes made to the CollapsingQParserPlugin and ExpandComponent in
> the 5x branch that were driven by changes to the Lucene Collectors API and
> DocValues API. This ticket is to review the 5x implementation and make any
> changes necessary in preparation for a 5.0 release.
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