jpountz commented on a change in pull request #746: LUCENE-8885: Optimise BKD
reader by exploiting cardinality information stored on leaves
URL: https://github.com/apache/lucene-solr/pull/746#discussion_r298140894
##########
File path: lucene/core/src/java/org/apache/lucene/util/bkd/BKDReader.java
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@@ -780,4 +783,43 @@ public int getDocCount() {
public boolean isLeafNode(int nodeID) {
return nodeID >= leafNodeOffset;
}
+
+ protected static class BKDReaderDocIDSetIterator extends DocIdSetIterator {
+
+ int idx;
+ int length;
+ int offset;
+ int[] docIds;
+
+ public BKDReaderDocIDSetIterator(int maxPointsInLeafNode) {
+ this.docIds = new int[maxPointsInLeafNode];
+ }
+
+ @Override
+ public int docID() {
+ if (idx == -1) {
+ return -1;
+ }
+ return docIds[offset + idx];
+ }
+
+ @Override
+ public int nextDoc() throws IOException {
+ if (idx == length - 1) {
+ return DocIdSetIterator.NO_MORE_DOCS;
+ }
+ idx++;
+ return docIds[offset + idx];
+ }
+
+ @Override
+ public int advance(int target) throws IOException {
+ throw new UnsupportedOperationException();
Review comment:
I think it'd be better to support it, even if slow. Eg. you can return
`slowAdvance(target)`.
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