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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 edited comment on SOLR-6581 at 12/3/14 2:27 PM:
---------------------------------------------------------------

The latest patch includes changes for both the CollapsingQParserPlugin and the 
ExpandComponent. These changes are designed to provide the 5.0 version with the 
same performance characteristics as the 4.0 versions.

This is somewhat of an 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.


was (Author: joel.bernstein):
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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