atris commented on a change in pull request #916: LUCENE-8213: Asynchronous 
Caching in LRUQueryCache
URL: https://github.com/apache/lucene-solr/pull/916#discussion_r331365438
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java
 ##########
 @@ -88,13 +92,47 @@
  * @lucene.experimental
  */
 public class LRUQueryCache implements QueryCache, Accountable {
+  /** Act as key for the inflight queries map */
+  private static class MapKey {
+    private final Query query;
+    private final IndexReader.CacheKey cacheKey;
+
+    public MapKey(Query query, IndexReader.CacheKey cacheKey) {
+      this.query = query;
+      this.cacheKey = cacheKey;
+    }
+
+    public Query getQuery() {
+      return query;
+    }
+
+    public IndexReader.CacheKey getCacheKey() {
+      return cacheKey;
+    }
+
+    @Override
+    public int hashCode() { return query.hashCode() ^ cacheKey.hashCode(); }
 
 Review comment:
   Removed the key for now since the parent set is now removed

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