[SOLR-8230] Create Facet Telemetry for Nested Facet Query

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.5, 6.0
• Component/s: Facet Module
• Assignee: Unassigned
• Reporter: Michael Sun
• Created: 02/Nov/15 22:26
• Updated: 09/May/16 18:55
• Resolved: 18/Dec/15 16:49

Description

This is the first step for SOLR-8228 Facet Telemetry. It's going to implement the telemetry for a nested facet query and put the information obtained in debug field in response.

Here is an example of telemetry returned from query.
Query

curl http://localhost:8228/solr/films/select -d 'q=*:*&wt=json&indent=true&debugQuery=true&json.facet={
top_genre: {
  type:terms,
  field:genre,
  numBucket:true,
  limit:2,
  facet: {
    top_director: {
        type:terms,
        field:directed_by,
        numBuckets:true,
        limit:2
    },
    first_release: {
        type:terms,
        field:initial_release_date,
        sort:{index:asc},
        numBuckets:true,
        limit:2
    }
  }
}
}'

Telemetry returned (inside debug part)

    "facet-trace":{
      "processor":"FacetQueryProcessor",
      "elapse":1,
      "query":null,
      "sub-facet":[{
          "processor":"FacetFieldProcessorUIF",
          "elapse":1,
          "field":"genre",
          "limit":2,
          "sub-facet":[{
              "filter":"genre:Drama",
              "processor":"FacetFieldProcessorUIF",
              "elapse":0,
              "field":"directed_by",
              "limit":2},
            {
              "filter":"genre:Drama",
              "processor":"FacetFieldProcessorNumeric",
              "elapse":0,
              "field":"initial_release_date",
              "limit":2},
            {
              "filter":"genre:Comedy",
              "processor":"FacetFieldProcessorUIF",
              "elapse":0,
              "field":"directed_by",
              "limit":2},
            {
              "filter":"genre:Comedy",
              "processor":"FacetFieldProcessorNumeric",
              "elapse":0,
              "field":"initial_release_date",
              "limit":2}]}]},