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   * 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.distributed.test;
  
  import org.junit.Test;
  
  import org.apache.cassandra.distributed.Cluster;
  
  import static java.lang.Boolean.TRUE;
  import static org.apache.cassandra.distributed.api.ConsistencyLevel.ALL;
  import static org.apache.cassandra.distributed.shared.AssertUtils.assertRows;
  import static org.apache.cassandra.distributed.shared.AssertUtils.row;
  
  public class UDFTest extends TestBaseImpl
  {
      @Test
      public void testUDFContextKeyspaceNotNull() throws Throwable
      {
          /*
          To test the keyspace is not null in the context we call UDFContext.newUDTValue() because it
          relies on the keyspace not being null.
           */
          String[] createStmts = {
          "CREATE TABLE " + KEYSPACE + ".current (city text, PRIMARY KEY (city))",
          "CREATE TYPE IF NOT EXISTS " + KEYSPACE + ".aggst (lt int, ge int)",
          "CREATE FUNCTION " + KEYSPACE + ".udf_not_null ()\n" +
          "CALLED ON NULL INPUT\n" +
          "RETURNS boolean LANGUAGE java AS $$\n" +
          "udfContext.newUDTValue(\"aggst\");\n" +
          "return Boolean.TRUE;\n" +
          "$$;",
          };
  
          try (Cluster cluster = init(Cluster.create(1, config -> config.set("enable_user_defined_functions", "true"))))
          {
              for (String stmt : createStmts)
                  cluster.schemaChange(stmt);
  
              cluster.coordinator(1).execute("INSERT INTO " + KEYSPACE + ".current (city) VALUES ('Helsinki')", ALL);
  
              assertRows(cluster.coordinator(1).execute("SELECT " + KEYSPACE + ".udf_not_null() AS m FROM " + KEYSPACE + ".current", ALL), row(TRUE));
  
              cluster.get(1).shutdown().get();
              cluster.get(1).startup();
  
              assertRows(cluster.coordinator(1).execute("SELECT " + KEYSPACE + ".udf_not_null() AS m FROM " + KEYSPACE + ".current", ALL), row(TRUE));
          }
      }
  }
  