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https://issues.apache.org/jira/browse/SOLR-2412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007411#comment-13007411
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Toke Eskildsen commented on SOLR-2412:
--------------------------------------
The syntax for calling is kept close to SOLR-64 and SOLR-792. The essential
commands are {{qt=exprh&efacet=true}} to activate faceting,
{{efacet.hierarchical=true&efacet.field=mypath}} for hierarchical.
Sorting is controlled with {{efacet.sort=count|index|locale}}. If locale is
chosen, the locale is selected with {{efacet.sort.locale=da}}. The result set
is limited with {{efacet.hierarchical.levels=99}} and {{efacet.limit=100}} to
control the maximum depth and the maximum number of entries at each level.
Example:
{code}
http://localhost:8983/solr/select/?q=*:*&rows=0&fl=id&indent=0n&qt=exprh&efacet=true&efacet.field=path_ss&efacet.hierarchical=true&efacet.hierarchical.levels=99&efacet.limit=10
{code}
{code}
<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">204</int>
</lst>
<result name="response" numFound="1000000" start="0">
<doc>
<str name="id">1</str>
</doc>
</result>
<lst name="efacet_counts">
<lst name="efacet_fields">
<lst name="path_ss">
<str name="field">path_ss</str>
<lst name="paths">
<long name="recursivecount">1000000</long>
<long name="potentialtags">1000000</long>
<long name="totaltags">101</long>
<long name="count">101</long>
<int name="level">0</int>
<lst name="sub">
<lst name="L0_T1">
<int name="count">1</int>
<lst name="sub">
<long name="recursivecount">9901</long>
<long name="potentialtags">9901</long>
<long name="totaltags">103</long>
<long name="count">103</long>
<int name="level">1</int>
<lst name="sub">
<lst name="L1_T1">
<int name="count">1</int>
<lst name="sub">
<long name="recursivecount">97</long>
<long name="potentialtags">97</long>
<long name="totaltags">97</long>
<long name="count">97</long>
<int name="level">2</int>
<lst name="sub">
<lst name="L2_T1">
<int name="count">1</int>
</lst>
...
{code}
I'm currently doing some performance (memory and speed) comparisons of SOLR-64,
SOLR-792 and SOLR-2412, which will be added later.
> Multipath hierarchical faceting
> -------------------------------
>
> Key: SOLR-2412
> URL: https://issues.apache.org/jira/browse/SOLR-2412
> Project: Solr
> Issue Type: New Feature
> Components: SearchComponents - other
> Affects Versions: 4.0
> Environment: Fast IO when huge hierarchies are used
> Reporter: Toke Eskildsen
> Labels: contrib, patch
> Attachments: SOLR-2412.patch
>
>
> Hierarchical faceting with slow startup, low memory overhead and fast
> response. Distinguishing features as compared to SOLR-64 and SOLR-792 are
> * Multiple paths per document
> * Query-time analysis of the facet-field; no special requirements for
> indexing besides retaining separator characters in the terms used for faceting
> * Optional custom sorting of tag values
> * Recursive counting of references to tags at all levels of the output
> This is a shell around LUCENE-2369, making it work with the Solr API. The
> underlying principle is to reference terms by their ordinals and create an
> index wide documents to tags map, augmented with a compressed representation
> of hierarchical levels.
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