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https://issues.apache.org/jira/browse/SOLR-2894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13980662#comment-13980662
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Trey Grainger commented on SOLR-2894:
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Hi [~otis], I appreciate your interest here. That's correct: no previously
working behavior was changed, and there are two things added with this patch:
1) distributed support, and 2) support for a single-level pivot facets (this
previously threw an exception but is now supported:
facet.pivot=aSingleFieldName).
For context on #2, we found no good reason to disallow a single-level pivot
facet (functions like to a field facet but with the pivot facet output format),
it made implementing distributed pivot faceting easier since a single level
could be considered when refining, and there was work in some downstream issues
like SOLR-3583 (adding percentiles and other stats to pivot facets) which was
dependent upon being able to easily alternate between any number of facet
levels for analytics purposes, so we just added the support for a single level.
This also makes it easier to build analytics tools without having to
arbitrarily alternate between field facets and pivot facets and their
corresponding output formats based upon the number of levels.
The end result is that no previously working capabilities have been modified,
but distributed support for any number of pivot levels has been added.
> Implement distributed pivot faceting
> ------------------------------------
>
> Key: SOLR-2894
> URL: https://issues.apache.org/jira/browse/SOLR-2894
> Project: Solr
> Issue Type: Improvement
> Reporter: Erik Hatcher
> Fix For: 4.9, 5.0
>
> Attachments: SOLR-2894-reworked.patch, SOLR-2894.patch,
> SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch,
> SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch,
> SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch,
> SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch, SOLR-2894.patch,
> SOLR-2894.patch, SOLR-2894.patch, dateToObject.patch
>
>
> Following up on SOLR-792, pivot faceting currently only supports
> undistributed mode. Distributed pivot faceting needs to be implemented.
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