msokolov commented on a change in pull request #413:
URL: https://github.com/apache/lucene/pull/413#discussion_r737073221
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File path: lucene/core/src/java/org/apache/lucene/search/KnnVectorQuery.java
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@@ -60,7 +60,8 @@ public KnnVectorQuery(String field, float[] target, int k) {
public Query rewrite(IndexReader reader) throws IOException {
TopDocs[] perLeafResults = new TopDocs[reader.leaves().size()];
for (LeafReaderContext ctx : reader.leaves()) {
- perLeafResults[ctx.ord] = searchLeaf(ctx, Math.min(k, reader.numDocs()));
+ int numDocs = ctx.reader().numDocs();
+ perLeafResults[ctx.ord] = numDocs > 0 ? searchLeaf(ctx, Math.min(k,
numDocs)) : NO_RESULTS;
Review comment:
Thanks for fixing this - it makes sense to me use `size()` instead of
`numDocs()`, or even simply `k`; I wasn't aware of the costly nature of that
call. Indeed the idea here was just to avoid spending extra work on tiny
segments; something I noticed all the time in tests, but which is probably not
much of an issue in reality.
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