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https://issues.apache.org/jira/browse/SOLR-6354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130901#comment-14130901
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Hoss Man commented on SOLR-6354:
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bq. Also, regarding changing the output key: either this was either broken
already, or I broke it somehow.
Yeah, beyond the initial problem you pointed out about code duplication dealing
with where/how the StatsValues instances are constructed, theres also
inconsistencies in when/how/if the localparams are parsed. I'm tackling that
in SOLR-6507 first.
> 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
> Attachments: TstStatsComponent.java
>
>
> 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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