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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