MarcusSorealheis commented on code in PR #12208:
URL: https://github.com/apache/lucene/pull/12208#discussion_r1157660036
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lucene/sandbox/src/java/org/apache/lucene/sandbox/search/TermAutomatonQuery.java:
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@@ -442,8 +442,44 @@ public boolean isCacheable(LeafReaderContext ctx) {
@Override
public Explanation explain(LeafReaderContext context, int doc) throws
IOException {
- // TODO
- return null;
+ Scorer scorer = scorer(context);
+ if (scorer == null) {
+ return Explanation.noMatch("No matching terms in the document");
+ }
+
+ int advancedDoc = scorer.iterator().advance(doc);
+ if (advancedDoc != doc) {
+ return Explanation.noMatch("No matching terms in the document");
+ }
+
+ float score = scorer.score();
+ LeafSimScorer leafSimScorer = ((TermAutomatonScorer)
scorer).getLeafSimScorer();
+ EnumAndScorer[] enums = ((TermAutomatonScorer) scorer).getEnums();
+
+ List<Explanation> termExplanations = new ArrayList<>();
+ for (EnumAndScorer enumAndScorer : enums) {
+ if (enumAndScorer != null) {
+ PostingsEnum postingsEnum = enumAndScorer.posEnum;
+ if (postingsEnum.docID() == doc) {
+ float termScore = leafSimScorer.score(doc, postingsEnum.freq());
+ termExplanations.add(
+ Explanation.match(
+ postingsEnum.freq(),
+ "term frequency in the document",
+ Explanation.match(
+ termScore,
+ "score for term: " +
idToTerm.get(enumAndScorer.termID).utf8ToString())));
+ }
+ }
+ }
+
+ if (termExplanations.isEmpty()) {
+ return Explanation.noMatch("No matching terms in the document");
+ }
+
+ Explanation freqExplanation =
+ Explanation.match(score, "TermAutomatonQuery, product of:",
termExplanations);
Review Comment:
Yep, this is is an error. Good catch.
`termExplanations.add`
I believe that maybe my thinking when I wrote this was born out of many
operations in the explanation. The score is definitely a sum of products,
differences, quotients and more. I'll fix in the next commit.
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