gautamworah96 commented on a change in pull request #242:
URL: https://github.com/apache/lucene/pull/242#discussion_r689713492
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File path: lucene/core/src/java/org/apache/lucene/search/Weight.java
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@@ -174,6 +174,27 @@ public BulkScorer bulkScorer(LeafReaderContext context)
throws IOException {
return new DefaultBulkScorer(scorer);
}
+ /**
+ * Counts the number of documents that match a given {@link
Weight#parentQuery} in a leaf. The
+ * default implementation creates a {@link TotalHitCountCollector} and
scores it using a
+ * BulkScorer {@link Weight#bulkScorer(LeafReaderContext)}}. Specific query
classes should
+ * override it to provide faster implementations. Look at {@link
+ * MatchAllDocsQuery#createWeight(IndexSearcher, ScoreMode, float)} for an
example
+ *
+ * @param context the {@link org.apache.lucene.index.LeafReaderContext} for
which to return the
+ * count.
+ * @return integer count of the number of matches
+ * @throws IOException if there is a low-level I/O error
+ */
+ public int count(LeafReaderContext context) throws IOException {
+ TotalHitCountCollector totalHitCountCollector = new
TotalHitCountCollector();
+ LeafCollector leafCollector =
totalHitCountCollector.getLeafCollector(context);
+ // TODO: can we cache this bulkScorer call?
+ BulkScorer scorer = this.bulkScorer(context);
+ scorer.score(leafCollector, context.reader().getLiveDocs());
Review comment:
Added a commit to fix it: 91b77f1
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