Yevhen Tienkaiev created SOLR-14996:
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             Summary: Facet incorrect counts when FQ exclusion applied with 
collapsing
                 Key: SOLR-14996
                 URL: https://issues.apache.org/jira/browse/SOLR-14996
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: faceting
    Affects Versions: 8.6.3
            Reporter: Yevhen Tienkaiev


*numFound* not correct according to what is displayed in facets when in used 
collapsing and FQ with tag.

Here example query:
{code}
curl --location --request GET 
'http://localhost:8981/solr/test/select?facet.field={!ex=selected}job_type&facet=on&fq={!collapse%20field=user_id}&fq={!tag=selected}job_type:thinker&q=*:*&rows=0'
{code}

result is:
{code}
{
    "responseHeader": {
        "zkConnected": true,
        "status": 0,
        "QTime": 15,
        "params": {
            "q": "*:*",
            "facet.field": "{!ex=selected}job_type",
            "fq": [
                "{!collapse field=user_id}",
                "{!tag=selected}job_type:thinker"
            ],
            "rows": "0",
            "facet": "on"
        }
    },
    "response": {
        "numFound": 850,
        "start": 0,
        "maxScore": 1.0,
        "numFoundExact": true,
        "docs": []
    },
    "facet_counts": {
        "facet_queries": {},
        "facet_fields": {
            "job_type": [
                "runner",
                220,
                "developer",
                202,
                "digger",
                202,
                "thinker",
                195,
                "ninja",
                181
            ]
        },
        "facet_ranges": {},
        "facet_intervals": {},
        "facet_heatmaps": {}
    }
}
{code}

as you can see there FQ with 
{code}
{!tag=selected}job_type:thinker
{code}
and facets with
{code}
{!ex=selected}job_type
{code}

but in results I see for *thinker* 195, but *numFound* is 850.

Expected:
*thinker* 195, but *numFound* is 195
*or*
*thinker* 850, but *numFound* is 850

You can use this simple project to reproduce the issue 
https://github.com/Hronom/solr-cloud-basic-auth/tree/main/solr-cloud-playground-collapsing



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