adelapena commented on code in PR #2310:
URL: https://github.com/apache/cassandra/pull/2310#discussion_r1223089676


##########
test/unit/org/apache/cassandra/cql3/validation/operations/CQLVectorTest.java:
##########
@@ -0,0 +1,151 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.cassandra.cql3.validation.operations;
+
+import org.junit.Test;
+
+import org.apache.cassandra.cql3.CQLTester;
+
+public class CQLVectorTest extends CQLTester.InMemory

Review Comment:
   I think we should probably add some tests for functions. For example, the 
following doesn't work:
   ```java
   @Test
   public void functions()
   {
       VectorType<Integer> type = VectorType.getInstance(Int32Type.instance, 2);
       Vector<Integer> vector = vector(1, 2);
   
       NativeFunctions.instance.add(new NativeScalarFunction("f", type, type)
       {
           @Override
           public ByteBuffer execute(ProtocolVersion protocol, List<ByteBuffer> 
parameters)
           {
               return parameters.get(0);
           }
       });
       
       createTable(KEYSPACE, "CREATE TABLE %s (pk int primary key, value 
vector<int, 2>)");
       execute("INSERT INTO %s (pk, value) VALUES (0, ?)", vector);
   
       assertRows(execute("SELECT f(value) FROM %s WHERE pk=0"), row(vector));
       assertRows(execute("SELECT f([1, 2]) FROM %s WHERE pk=0"), row(vector));
   }
   ```
   It throws `Type error: [1, 2] cannot be passed as argument 0 of function 
system.f of type vector<int, 2>`. 
   
   That's because the terminal argument in the second function call is a 
`Selectable.WithList`, and that selectable refuses to be assigned to the vector 
type. That happens in `Selectable.WithList#testAssignment`.



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