Hi all, I'm noticing an issue where rerank queries never appear to enter the Solr queryResultCache
You can notice this, as a user, by simply repeating requests to a node. You'll get an instantaneous response repeating most Solr queries. However, repeating anything with rq= added, each response takes about the same amount of time. I dug into this some in a debugger, and created a test (in LTR) to recreate this https://github.com/apache/solr/compare/main...softwaredoug:solr:no-rerank-caching?expand=1 We do a lookup using a NON rewritten version of the query, here https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/search/SolrIndexSearcher.java#L1561 Later, prior to executing the query, Lucene's search method performs a rewrite: https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java#L514 This causes a rerank query (like LTR's) to rewrite its main query, saving it internally: https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/search/AbstractReRankQuery.java#L100 Then this is what's put into the cache So later on, when the same query comes in, in its non-rewritten form, its never seen in the cache Am I missing something? It would appear that any query where its child queries get rewritten would never get cached by Solr? Thanks -Doug
