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https://issues.apache.org/jira/browse/SOLR-12567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553078#comment-16553078
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Hoss Man commented on SOLR-12567:
---------------------------------
I went ahead and created SOLR-12581 as an initial sanity check that this new
syntax/imple would actually be useful for some of optional aggregation features
i'm anticipating. apply that patch on top of this one to see a practical
usecase.
> Enhance JSON Facet aggregation syntax to support a JSON Object based
> "type:func" form that supports local params
> ----------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-12567
> URL: https://issues.apache.org/jira/browse/SOLR-12567
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Assignee: Hoss Man
> Priority: Major
> Attachments: SOLR-12567.patch
>
>
> In SOLR-11709 I proposed adding an "expanded" JSON Object syntax for
> specifying aggregation stats, as a way to ultimately support applying domain
> changes to aggregations.
> Having since done more work with the implementation of aggregations and how
> they use SlotAcc(umulators) and how bucket sorting on aggregations work, I
> now realize that the goal of SOLR-11709 is pretty hard -- but the idea of
> this "expanded syntax" would still be useful as a way to specify Local Params
> to the ValueSourceParser used for the aggregation -- and would but stats on
> par with other {{"type"}} facets (syntactically).
> For things like {{relatedness(...)}} (or other user defined custom
> aggregations) it would allow for new optional configuration using "named"
> params w/o needing an unweildy function syntax (see
> [comment#16466664|https://issues.apache.org/jira/browse/SOLR-9480?focusedCommentId=16466664&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16466664]
> in SOLR-9480). But even for simple aggregations the expanded syntax may
> help folks with readability of expressions(w/o needing to resort to global
> params) ...
> Proposed syntax...
> {noformat}
> "average_roi" : {
> "type": "func",
> "func": "avg(div($numer,$denom))",
> "numer": "mul(popularity,rating)",
> "denom": "mul(price,size)"
> }
> {noformat}
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