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https://issues.apache.org/jira/browse/SOLR-14921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17234003#comment-17234003
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Michael Gibney commented on SOLR-14921:
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Thanks for taking a look, [~gerlowskija]! You're right about how the "templated
bucketed facet query" would work; but checking the traditional faceting code,
it looks like whitelist-of-terms does essentially exactly the same thing –
i.e., the call to {{SimpleFacets.getListedTermCounts(...)}} ultimately calls
{{SolrIndexSearcher.numDocs(...)}} for each specified term. Both this, and the
way templated bucketed query would work, are close cousins to the {{enum}}
facet method. So for a relatively static list of specified terms (and/or an
appropriately-sized {{filterCache}}) I'd expect the performance to be better
than standard "uninverted/docValues-style" field faceting – and in any case I'd
definitely expect the performance to be nearly identical across all the
implementations in question.
> terms filter in json.facet
> --------------------------
>
> Key: SOLR-14921
> URL: https://issues.apache.org/jira/browse/SOLR-14921
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: gopikannan venugopalsamy
> Priority: Minor
>
> Hi,
> In normal facet request below can be used to filter the facet terms. I am
> not able to do the same using json.facet. It would be useful in case of
> multivalued field facet and only filtered terms needs to be returned.
>
> h3. Limiting Facet with Certain Terms
> To limit field facet with certain terms specify them comma separated with
> {{terms}} local parameter. Commas and quotes in terms can be escaped with
> backslash, as in {{\,}}. In this case facet is calculated on a way similar to
> {{facet.method=enum}} , but ignores {{facet.enum.cache.minDf}}. For example:
> {{facet.field=\{!terms='alfa,betta,with\,with\',with space'}symbol}}
> {{}}
> [https://lucene.apache.org/solr/guide/6_6/faceting.html]
>
> Just like prefix parameter in json.facet I think we can add terms parameter
> and use it. Something like below.
>
> json.facet=\{facets:{type:terms,field:field1,terms:"a,b,c"}}
>
>
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