FYI there is also KeywordField, which combines StringField and SortedSetDocValuesField. It supports filtering, sorting, faceting and retrieval. It's my go-to field for string values.
Le ven. 20 oct. 2023, 12:20, Michael McCandless <luc...@mikemccandless.com> a écrit : > There are some differences. > > StringField is indexed into the inverted index (postings) so you can do > efficient filtering. You can also store in stored fields to retrieve. > > FacetField does everything StringField does (filtering, storing (maybe?)), > but in addition it stores data for faceting. I.e. you can compute facet > counts or simple aggregations at search time. > > FacetField is also hierarchical: you can filter and facet by different > points/levels of your hierarchy. > > Mike McCandless > > http://blog.mikemccandless.com > > > On Fri, Oct 20, 2023 at 5:43 AM Michael Wechner <michael.wech...@wyona.com > > > wrote: > > > Hi > > > > I have found the following simple Facet Example > > > > > > > https://github.com/apache/lucene/blob/main/lucene/demo/src/java/org/apache/lucene/demo/facet/SimpleFacetsExample.java > > > > whereas for a simple categorization of documents I currently use > > StringField, e.g. > > > > doc1.add(new StringField("category", "book")); > > doc1.add(new StringField("category", "quantum_physics")); > > doc1.add(new StringField("category", "Neumann")) > > doc1.add(new StringField("category", "Wheeler")) > > > > doc2.add(new StringField("category", "magazine")); > > doc2.add(new StringField("category", "astro_physics")); > > > > which works well, but would it be better to use Facets for this, e.g. > > > > doc1.add(new FacetField("media-type", "book")); > > doc1.add(new FacetField("topic", "physics", "quantum"); > > doc1.add(new FacetField("author", "Neumann"); > > doc1.add(new FacetField("author", "Wheeler"); > > > > doc1.add(new FacetField("media-type", "magazine")); > > doc1.add(new FacetField("topic", "physics", "astro"); > > > > ? > > > > IIUC the StringField approach is more general, whereas the FacetField > > approach allows to do a more specific categorization / search. > > Or do I misunderstand this? > > > > Thanks > > > > Michael > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > >
