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https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032238#comment-13032238
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Bill Bell commented on LUCENE-1421:
-----------------------------------
Say we have 4 documents:
docid=1
hgid=1
age=10
docid=2
hgid=1
age=10
docid=3
hgid=2
age=12
docid=4
hgid=4
age=11
If we group by hgid, we would get:
hgid=1
>docid=1
hgid=1
age=10
>docid=2
hgid=1
age=10
hgid=3
>docid=3
hgid=2
age=12
hgid=4
>docid=4
hgid=4
age=11
If I set Facet Counts = POST
age: 10 (1 document)
age: 11 (1 document)
age: 12 (1 document)
If I set Facet Counts = PRE
age: 10 (2 document)
age: 11 (1 document)
age: 12 (1 document)
The only way grouping works in Solr now is Facet Counts = PRE.
Thanks.
> Ability to group search results by field
> ----------------------------------------
>
> Key: LUCENE-1421
> URL: https://issues.apache.org/jira/browse/LUCENE-1421
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Artyom Sokolov
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 3.2, 4.0
>
> Attachments: LUCENE-1421.patch, LUCENE-1421.patch,
> lucene-grouping.patch
>
>
> It would be awesome to group search results by specified field. Some
> functionality was provided for Apache Solr but I think it should be done in
> Core Lucene. There could be some useful information like total hits about
> collapsed data like total count and so on.
> Thanks,
> Artyom
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