Mikep86 commented on code in PR #13697:
URL: https://github.com/apache/lucene/pull/13697#discussion_r1752115832
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lucene/join/src/java/org/apache/lucene/search/join/ToParentBlockJoinQuery.java:
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@@ -242,14 +242,25 @@ public int nextDoc() throws IOException {
@Override
public int advance(int target) throws IOException {
- if (target >= parentBits.length()) {
- return doc = NO_MORE_DOCS;
- }
- final int firstChildTarget = target == 0 ? 0 :
parentBits.prevSetBit(target - 1) + 1;
+ final int prevParent =
+ target == 0 ? 0 : parentBits.prevSetBit(Math.min(target,
parentBits.length()) - 1);
+
int childDoc = childApproximation.docID();
- if (childDoc < firstChildTarget) {
- childDoc = childApproximation.advance(firstChildTarget);
+ if (childDoc < prevParent) {
+ childDoc = childApproximation.advance(prevParent);
+ }
+
+ // TODO: Can we assume that doc 0 is never a real parent that also
matches the child query?
Review Comment:
Because we use 0 to indicate "no previous parent doc", we cannot detect the
case when:
- A real parent doc exists at 0
- That parent doc matches the child query
I don't think this is a problem since any real parent doc at 0 would never
be returned by `ToParentBlockJoinQuery` since it cannot have child docs.
Thoughts?
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