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https://issues.apache.org/jira/browse/SOLR-792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146406#comment-13146406
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Dan Cooper commented on SOLR-792:
---------------------------------
I have submitted a patch for distributed pivoting above, however I have since
realised that while it works well on the small sample data it does not scale
well. This is due to the use of NamedList objects for storing and merging the
pivoted data.
I have since improved the code to use maps whilst merging the pivots and it
runs well across our large indexes. I will submit this again in a few days
when I have had time to review and package up the code properly (there is some
proprietary code I need to separate it from).
My company relies on this functionality and we have it working with Solr 4 so
we would like to contribute it back to the community if possible.
> Pivot (ie: Decision Tree) Faceting Component
> --------------------------------------------
>
> Key: SOLR-792
> URL: https://issues.apache.org/jira/browse/SOLR-792
> Project: Solr
> Issue Type: New Feature
> Reporter: Erik Hatcher
> Assignee: Yonik Seeley
> Priority: Minor
> Attachments: SOLR-792-PivotFaceting.patch,
> SOLR-792-PivotFaceting.patch, SOLR-792-PivotFaceting.patch,
> SOLR-792-PivotFaceting.patch, SOLR-792-as-helper-class.patch,
> SOLR-792-distributed.patch, SOLR-792-raw-type.patch, SOLR-792.patch,
> SOLR-792.patch, SOLR-792.patch, SOLR-792.patch, SOLR-792.patch,
> SOLR-792.patch, SOLR-792.patch
>
>
> A component to do multi-level faceting.
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