[jira] [Updated] (SOLR-11765) Ability to Facet on a Function

["Tim Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-11765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Owen updated SOLR-11765:
----------------------------
    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
>            Priority: Major
>         Attachments: SOLR-11765.patch, 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)
> Example usage:
> {noformat}
> { facet : { dayOfWeek : { type : function, f : "chronofield(my_date_field,DAY_OF_WEEK)", sort : "count desc" } } }
> {noformat}
> I did some refactoring in the facet parser, to hoist some common code for sort and pagination parsing.



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