romseygeek commented on code in PR #15727:
URL: https://github.com/apache/lucene/pull/15727#discussion_r2847272568
##########
lucene/join/src/java/org/apache/lucene/search/join/ToParentDocValues.java:
##########
@@ -242,6 +296,23 @@ public int advance(int target) throws IOException {
return nextDoc();
}
+ /**
+ * Advance the iterator to exactly {@code targetParentDocID} and return
whether it has a value
+ * derived from its child documents. {@code targetParentDocID} must be
greater than or equal to
+ * the current {@link #docID() doc ID}. After this method returns, {@link
#docID()} returns {@code
+ * targetParentDocID}.
+ *
+ * <p>A parent document is considered to have a value when at least one of
its child documents has
+ * a value. When {@code skipParentsWithMissingChildValues} is {@code true},
the parent is
Review Comment:
TermOrdValComparator has this snippet:
```
if (sortMissingLast) {
missingOrd = Integer.MAX_VALUE;
} else {
missingOrd = -1;
}
```
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