cpoerschke commented on code in PR #13635:
URL: https://github.com/apache/lucene/pull/13635#discussion_r1778221739


##########
lucene/core/src/java/org/apache/lucene/search/AbstractKnnVectorQuery.java:
##########
@@ -156,6 +196,55 @@ private TopDocs getLeafResults(
     }
   }
 
+  private DocIdSetIterator executeSeedQuery(LeafReaderContext ctx, Weight 
seedWeight)
+      throws IOException {
+    if (seedWeight != null) {
+      // Execute the seed query
+      TopScoreDocCollector seedCollector =
+          new TopScoreDocCollectorManager(
+                  k /* numHits */,
+                  null /* after */,
+                  Integer.MAX_VALUE /* totalHitsThreshold */,
+                  false /* supportsConcurrency */)
+              .newCollector();
+      LeafCollector leafCollector;
+      try {
+        leafCollector = seedCollector.getLeafCollector(ctx);
+        if (leafCollector != null) {
+          BulkScorer scorer = seedWeight.bulkScorer(ctx);
+          if (scorer != null) {
+            scorer.score(
+                leafCollector,
+                ctx.reader().getLiveDocs(),
+                0 /* min */,
+                DocIdSetIterator.NO_MORE_DOCS /* max */);
+          }
+          leafCollector.finish();
+        }
+      } catch (
+          @SuppressWarnings("unused")
+          CollectionTerminatedException e) {
+        // there is no doc of interest in this reader context
+        // continue with the following leaf
+        leafCollector = null;
+      }
+
+      TopDocs seedTopDocs = seedCollector.topDocs();
+      return convertDocIdsToVectorOrdinals(ctx.reader(), new 
TopDocsDISI(seedTopDocs));

Review Comment:
   minor/subjective: could introduce local variable to avoid repeat 
`ctx.reader()` call and show that the two parts of the code using the reader 
are connected
   ```
   final LeafReader leafReader = ctx.reader();
   ```



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