[ 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org