Hi Mike
Thanks for your feedback!
IIUC in order to have the actual advantages of Facets one has to
"connect" it with a TaxonomyWriter
FacetsConfig config = new FacetsConfig();
DirectoryTaxonomyWriter taxoWriter = new DirectoryTaxonomyWriter(taxoDir);
indexWriter.addDocument(config.build(taxoWriter, doc));
right?
Thanks
Michael
Am 20.10.23 um 12:19 schrieb Michael McCandless:
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
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