LUCENE-8062: GlobalOrdinalsQuery is no longer eligible for caching

lucene/CHANGES.txt

@@ -121,6 +121,8 @@ Optimizations
 * LUCENE-7994: Use int/int scatter map to gather facet counts when the
   number of hits is small relative to the number of unique facet labels
   (Dawid Weiss, Robert Muir, Mike McCandless)
+
+* LUCENE-8062: GlobalOrdinalsQuery is no longer eligible for caching. (Jim Ferenczi)
   
 Tests
 

lucene/join/src/java/org/apache/lucene/search/join/GlobalOrdinalsQuery.java

@@ -156,7 +156,10 @@ final class GlobalOrdinalsQuery extends Query {
 
     @Override
     public boolean isCacheable(LeafReaderContext ctx) {
-      return DocValues.isCacheable(ctx, joinField);
+      // disable caching because this query relies on a top reader context
+      // and holds a bitset of matching ordinals that cannot be accounted in
+      // the memory used by the cache
+      return false;
     }
 
   }