Hi All, When running vector search with grouping in multi-shard setting, the KnnFloatVectorQuery is executed (2+rows) times.
The culprit is this function call in https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/search/grouping/distributed/command/TopGroupsFieldCommand.java#L202 if (needScores) { for (GroupDocs<?> group : topGroups.groups) { TopFieldCollector.populateScores(group.scoreDocs, searcher, query); } } Where https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/search/TopFieldCollector.java#L403 does final Weight weight = searcher.createWeight(searcher.rewrite(query), ScoreMode.COMPLETE, 1); Here, if the query is KnnFloatVectorQuery, *searcher.rewrite(query) *will execute the same vector search for each topGroups.groups a simple fix could be moving *searcher.rewrite(query) *out of the topGroups.groups loop. Thoughts? Best, Yue
