mkhludnev commented on code in PR #12245:
URL: https://github.com/apache/lucene/pull/12245#discussion_r1182354383
##########
lucene/join/src/java/org/apache/lucene/search/join/ToParentBlockJoinQuery.java:
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@@ -391,35 +391,86 @@ private void setScoreAndFreq() throws IOException {
}
this.score = (float) score;
}
-
- public Explanation explain(LeafReaderContext context, Weight childWeight)
throws IOException {
+ /*
+ * This instance of Explanation requires three parameters, context,
childWeight, and scoreMode.
+ * The scoreMode parameter considers Avg, Total, Min, Max, and None.
+ * */
+ public Explanation explain(LeafReaderContext context, Weight childWeight,
ScoreMode scoreMode)
+ throws IOException {
int prevParentDoc = parentBits.prevSetBit(parentApproximation.docID() -
1);
int start =
context.docBase + prevParentDoc + 1; // +1 b/c prevParentDoc is
previous parent doc
int end = context.docBase + parentApproximation.docID() - 1; // -1 b/c
parentDoc is parent doc
Explanation bestChild = null;
+ double childScoreSum = 0;
int matches = 0;
for (int childDoc = start; childDoc <= end; childDoc++) {
Explanation child = childWeight.explain(context, childDoc -
context.docBase);
if (child.isMatch()) {
matches++;
+ childScoreSum += child.getValue().doubleValue();
+
+ if (scoreMode == ScoreMode.Total) {
Review Comment:
Well, you know. With respect to `Total` (avg) providing an explain from one
of the matched children is useful.
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