maedhroz commented on code in PR #3892:
URL: https://github.com/apache/cassandra/pull/3892#discussion_r1953183837


##########
src/java/org/apache/cassandra/service/reads/DataResolver.java:
##########
@@ -275,6 +275,10 @@ private PartitionIterator 
resolveWithReplicaFilteringProtection(E replicas, Repa
 
     private  UnaryOperator<PartitionIterator> 
preCountFilterForReplicaFilteringProtection()
     {
+        // Key columns are immutable and should never need to participate in 
replica filtering
+        if (!command.rowFilter().hasNonKeyExpression())
+            return results -> results;

Review Comment:
   see CASSANDRA-19688 and then CASSANDRA-19938



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