[jira] [Created] (SOLR-6354) Support stats over functions

["Hoss Man (JIRA)" <ji...@apache.org>]

Hoss Man created SOLR-6354:
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             Summary: Support stats over functions
                 Key: SOLR-6354
                 URL: https://issues.apache.org/jira/browse/SOLR-6354
             Project: Solr
          Issue Type: Sub-task
            Reporter: Hoss Man


The majority of the logic in StatsValuesFactory for dealing with stats over fields just uses the ValueSource API.  There's very little reason we can't generalize this to support computing aggregate stats over any arbitrary function (or the scores from an arbitrary query).

Example...
{noformat}
stats.field={!func key=mean_rating mean=true}prod(user_rating,pow(editor_rating,2))
{noformat}

...would mean that we can compute a conceptual "rating" for each doc by multiplying the user_rating field by the square of the editor_rating field, and then we'd compute the mean of that "rating" across all docs in the set and return it as "mean_rating"



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