[jira] Reopened: (SOLR-680) StatsComponent - get min, max, sum, qt, avg of number fields

["Ryan McKinley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ryan McKinley reopened SOLR-680:
--------------------------------


the "median" calculation is incorrect.   As is, it assumens the DocSet has documents in order.

Also, the "median" is the only "twopass" operation and inherently could not work (easily) with distributed search.

Since 'median' is only marginally useful, i think we should take it out.

> 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
>            Assignee: Ryan McKinley
>            Priority: Minor
>             Fix For: 1.4
>
>         Attachments: SOLR-680.patch, SOLR-680.patch, SOLR-680.patch, SOLR-680.patch, 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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