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https://issues.apache.org/jira/browse/SOLR-11765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Owen updated SOLR-11765:
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Attachment: SOLR-11765.patch
> Ability to Facet on a Function
> ------------------------------
>
> Key: SOLR-11765
> URL: https://issues.apache.org/jira/browse/SOLR-11765
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module, JSON Request API
> Reporter: Tim Owen
> Attachments: SOLR-11765.patch
>
>
> This is an extension to the JSON facet functionality, to support faceting on
> a function. I have extended the parsing of json.facet to allow a 4th facet
> type (function) and you provide a function expression. You can also provide
> sort, limit and mincount, as it behaves similarly to faceting on a field.
> Subfacets work as normal - you can nest function facets anywhere you can use
> other types.
> The output is in the same format as field facets, but with a bucket per
> distinct value produced by the function. Hence the usage of this is most
> appropriate for situations where your function only produces a relatively
> small number of possible values. It's also recommended to have docValues on
> any field used by the function.
> Our initial use-case for this is with a function that extracts a given part
> from a date field's value e.g. day of week, or hour of day, where the
> possible range of output values is very low.
> Still TODO: documentation, unit tests, and possible extensions to support a
> missing bucket and functional sorting (currently it's only sortable by the
> bucket label or by volume)
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