Solr 9.7.0 - Boolean Query parser is not caching result in Query result cache in case of preFilter is used

[kumar gaurav]

Hi All

We are using bool query parser for hybrid search with
vectorSimilarty parser as a clause.

We got the issue that Boolean Query parser is not caching vectorSimilarity
result in Query result cache *in case preFilter is used *which is a culprit
for performance impact. We got Same behaviour with the knn parser as well.

We debugged it in Solr code and found that if pre-filter is used then
BooleanQuery.hashcode() is calculating different values even if it is the
same query requests. If we remove preFilter then the result cache works.

Solr Query
{
    "params": {
        "spellcheck": "true",
        "start": "0",
        "rows": "10",
        "q": "{!bool should=$vectorQuery}",
        "defType": "lucene",
        "vector":
"[-0.045949627,-0.027026573,-0.019423958,0.03261444,-0.009923472,0.017075274,-0.018088214,0.09207735,0.004494225,0.10026992...]",
        "preFilter": [
            "findable:true",
        ],
        "vectorQuery": "{!vectorSimilarity f=vector_1024$embeddings
minReturn=0.74 minTraverse=0.72 preFilter=$preFilter v=$vector}"
    }
}

*Is it a bug of Solr which is in line to be fixed in future ? *

*A lot of thanks in advance. Hoping reply from Alessandro Benedetti :). *



-- 
Thanks & Regards
Kumar Gaurav
+91 9313529899