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https://issues.apache.org/jira/browse/SOLR-680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan McKinley updated SOLR-680:
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Attachment: SOLR-680.patch
Koji -- this looks great!
I just updated the patch so it:
- handles null values better (skips them, but counts them)
- adds "missing"=number of null values for the field to the stats
- throws an error if you try stats on a tokenized or multivalue field
- registers the StatsComponet by default
- optionally calculates median value and standard deviation (requires a second
pass through the field cache)
NOTE -- this will break in distributed context... i'm not sure there is a
fix for that... we could return a weighted average? perhaps a better result
would be to return the raw values for each shard?
I'll upload this now, and start working on solrj integration with tests...
> StatsComponent - get min, max, sum, qt, avg of number fields
> ------------------------------------------------------------
>
> Key: SOLR-680
> URL: https://issues.apache.org/jira/browse/SOLR-680
> Project: Solr
> Issue Type: New Feature
> Components: search
> Reporter: Koji Sekiguchi
> Priority: Minor
> Fix For: 1.4
>
> Attachments: SOLR-680.patch, SOLR-680.patch
>
>
> StatsComponent - it returns min,max,sum,qt,avg of specified number fields:
> request parameters:
> &stats=on&stats.field=price
> {code:xml}
> <stats>
> <stats_fields>
> <lst name="price">
> <double name="min">10</double>
> <double name="max">30</double>
> <double name="avg">20</double>
> <double name="sum">60</double>
> <double name="qt">3</double>
> </lst>
> </stats_fields>
> </stats>
> {code}
> WRT "stats", the component can output sum and avg, but not sd and var.
> USE CASE:
> StatsComponent can be used to get "market price" of DocSet e.g. rental
> housing site, package tour site.
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