check why this does not work because of the List<V> generic type

check why this does not work because of the List generic type

public void open(ExecutionContext executionContext) {

context = executionContext.getBroadcast("context").iterator().next();

https://github.com/apache/incubator-wayang/blob/d75a5723989928ac2e633d76bf665b2a5cb3eaf1/wayang-ml4all/src/main/java/org/apache/wayang/ml4all/abstraction/plan/wrappers/AssignWrapper.java#L26


/*
 * 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.wayang.ml4all.abstraction.plan.wrappers;

import org.apache.wayang.ml4all.abstraction.api.Update;
import org.apache.wayang.ml4all.abstraction.plan.ML4allGlobalVars;

import java.util.List;

public class AssignWrapper<R> extends LogicalOperatorWrapperWithContext<ML4allGlobalVars, List<R>> { //TODO:check why this does not work because of the List<V> generic type

    Update<R,?> logOp;

    public AssignWrapper(Update logOp) {
        this.logOp = logOp;
    }

    @Override
    public ML4allGlobalVars apply(List<R> o) {
        ML4allGlobalVars newContext = context.clone();
        return this.logOp.assign(o, newContext);
    }

    @Override
    public void initialise() {

    }

//    @Override
//    public void open(ExecutionContext executionContext) {
//        context = executionContext.<ML4allGlobalVars>getBroadcast("context").iterator().next();
//
//    }
}

c3d0a623a7d8e7bac13e2adf6316762638dd2b33

apache / incubator-wayang

check why this does not work because of the List<V> generic type #375