Thank You Chris for an immediate response. I am using json facets and my
question was for json facets and using solr 7.2.1. Will try your approach.
Basically I want to use an average of the scores than the sum of the scores and
sort those buckets based on the average score. The scores am assuming would
have already been calculated in the QueryComponent when those docs were
collected from the original query and calculating the average and sorting the
buckets may be simple enough with your approach.
Thanks again for the reply.
On 7/18/18, 3:45 PM, "Chris Hostetter" <hossman_luc...@fucit.org> wrote:
: If I want to plug in my own sorting for facets, what would be the best
: approach. I know, out of the box, solr supports sort by facet count and
: sort by alpha. I want to plug in my own sorting (say by relevancy). Is
: there a way to do that? Where should I start with if I need to write a
: Custom Facet Component?
it sounds like you're talking about the "classic" facets (using
"facet.field") where facet.sort only supports "count" (desc) and "index"
(asc)
Adding a custom sort option there would be close to impossible.
The newer "json.facets" API supports a much more robust set of options,
that includes the ability to sort on an "aggregate" function across all
documents in the bucket...
https://lucene.apache.org/solr/guide/7_4/json-facet-api.html
some of the existing sort options there might solve your need, but it's
also possible using that API to write your own ValueSourceParser plugin
that can be used to sort facets as long as it returns ValueSources that
extend "AggValueSource"
: Basically I want to plug the scores calculated in earlier steps for the
: documents matched, do some kind of aggregation of the scores of the
: documents that fall under a facet and use this aggregate score to rank
IIUC what you want is possibly something like...
curl http://localhost:8983/solr/techproducts/query -d
'q=features:lcd&rows=0&
json.facet={
categories:{
type : terms,
field : cat,
sort : { x : desc },
facet:{
x : "sum(query($q))",
}
}
}
'
...which will sort the buckets by the sum of the scores of every document
in that bucket (using the original query .. but you could alternatively
sort by any aggregation of the scores from any arbitrary query / document
based function)
-Hoss
http://www.lucidworks.com/
