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https://issues.apache.org/jira/browse/SOLR-4214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve McKay updated SOLR-4214:
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Attachment: stats.patch
The primary new feature is hierarchical faceting, e.g. facet by vendor and then
facet each vendor by year. I've also added stats.sort, stats.limit, and
stats.offset field params. stats.sort syntax is
<sum|min|max|stdDev|average|sumOfSquares|count|missing|value>:<asc|desc> and
limit and offset work as in SQL. Faceting will generally use more RAM and be
faster than the 4.0 baseline. I've changed more than some might consider to be
strictly necessary; this is because a large part of my effort has been to make
faceting performant under adverse conditions, with large result sets and
faceting on fields with large (1m+) cardinalities.
One caveat: distributed stats are broken in this patch due to other work in
progress. Tests pass, although I changed a few test cases relating to what
happens when stats.field is completely absent in the result set. The existing
behavior is to return null as the stats result and my code returns zeroed-out
stats, which IMO is more felicitous anyway.
The attached patch is diffed from branches/lucene_solr_4_0.
> Hierarchical stats
> ------------------
>
> Key: SOLR-4214
> URL: https://issues.apache.org/jira/browse/SOLR-4214
> Project: Solr
> Issue Type: New Feature
> Components: SearchComponents - other
> Reporter: Steve McKay
> Attachments: stats.patch
>
>
> Hierarchical stats faceting, e.g. facet by vemdor and then facet each vendor
> by year.
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