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From "Martijn van Groningen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3099) Grouping module should allow subclasses to set the group key per document
Date Thu, 26 May 2011 00:20:47 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039444#comment-13039444
] 

Martijn van Groningen commented on LUCENE-3099:
-----------------------------------------------

In order to avoid double FC usage we need to let the grouping collectors instantiate the right
fieldcache for the right field. 
The current collectors always create a StringIndex (3.x) or DocTermsIndex (4.0). When you
sort on the same field as you group and this field is for example an int. Then a complete
new StringIndex / DocTermsIndex is put in the FieldCache.

> Grouping module should allow subclasses to set the group key per document
> -------------------------------------------------------------------------
>
>                 Key: LUCENE-3099
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3099
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>             Fix For: 3.2, 4.0
>
>
> The new grouping module can only group by a single-valued indexed field.
> But, if we make the 'getGroupKey' a method that a subclass could override, then I think
we could refactor Solr over to the module, because it could do function queries and normal
queries via subclass (I think).
> This also makes the impl more extensible to apps that might have their own interesting
group values per document.

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