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https://issues.apache.org/jira/browse/SOLR-2524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035673#comment-13035673
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Martijn van Groningen commented on SOLR-2524:
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bq. and maybe log a warning?
I also think a log warning should be added too. If users don't want that they
can reconfigure their logger not to log messages from the Grouping class.
bq. Was this a simple TermQuery
No a MatchDocAllQuery (*:*). I usually use that to maximize the number
documents to group on. Trying this on a simple term query that results in 8M
documents; the query with cache is a little bit (~5%) faster. For boolean
queries the cache does pay off. Grouping with cache is 20% faster than without.
Off course these are just numbers from my machine and my test index.
bq. Is it somehow possible Solr is already caching the queries results
itself...?
Only the filterCache is used for any filter query in the fq param. The main
query is not cached with the filterCache or QueryResultCache. This the same
behaviour as in the trunk.
> Adding grouping to Solr 3x
> --------------------------
>
> Key: SOLR-2524
> URL: https://issues.apache.org/jira/browse/SOLR-2524
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 3.2
> Reporter: Martijn van Groningen
> Assignee: Michael McCandless
> Attachments: SOLR-2524.patch
>
>
> Grouping was recently added to Lucene 3x. See LUCENE-1421 for more
> information.
> I think it would be nice if we expose this functionality also to the Solr
> users that are bound to a 3.x version.
> The grouping feature added to Lucene is currently a subset of the
> functionality that Solr 4.0-trunk offers. Mainly it doesn't support grouping
> by function / query.
> The work involved getting the grouping contrib to work on Solr 3x is
> acceptable. I have it more or less running here. It supports the response
> format and request parameters (expect: group.query and group.func) described
> in the FieldCollapse page on the Solr wiki.
> I think it would be great if this is included in the Solr 3.2 release. Many
> people are using grouping as patch now and this would help them a lot. Any
> thoughts?
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