dcapwell commented on code in PR #4328:
URL: https://github.com/apache/cassandra/pull/4328#discussion_r2292165239


##########
src/java/org/apache/cassandra/cql3/statements/CQL3CasRequest.java:
##########
@@ -558,15 +558,13 @@ private List<TxnWrite.Fragment> 
createWriteFragments(ClientState state)
             // see CASSANDRA-18337
             ModificationStatement modification = update.stmt.forTxn();
             QueryOptions options = update.options;
-            TxnWrite.Fragment fragment = 
modification.getTxnWriteFragment(idx++, state, options, partitionKey);
-            fragments.add(fragment);
+            fragments.addAll(modification.getTxnWriteFragment(idx++, state, 
options, partitionKey));

Review Comment:
   tested what happens when you have range tombstones (which allows this 
function to return empty list) and CAS blocks it before we get here
   
   ```
   org.apache.cassandra.exceptions.InvalidRequestException: DELETE statements 
must restrict all PRIMARY KEY columns with equality relations in order to 
delete non static columns
   
        at 
org.apache.cassandra.cql3.statements.RequestValidations.invalidRequest(RequestValidations.java:358)
        at 
org.apache.cassandra.cql3.statements.RequestValidations.checkTrue(RequestValidations.java:61)
        at 
org.apache.cassandra.cql3.statements.RequestValidations.checkFalse(RequestValidations.java:255)
        at 
org.apache.cassandra.cql3.statements.DeleteStatement$Parsed.prepareInternal(DeleteStatement.java:197)
        at 
org.apache.cassandra.cql3.statements.ModificationStatement$Parsed.prepare(ModificationStatement.java:1179)
        at 
org.apache.cassandra.cql3.statements.ModificationStatement$Parsed.prepare(ModificationStatement.java:1166)
        at 
org.apache.cassandra.cql3.statements.ModificationStatement$Parsed.prepare(ModificationStatement.java:1138)
        at 
org.apache.cassandra.cql3.QueryProcessor.getStatement(QueryProcessor.java:959)
   ```



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