Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/202#discussion_r23954389 --- Diff: flink-addons/flink-language-binding/src/main/java/org/apache/flink/languagebinding/api/java/common/OperationInfo.java --- @@ -0,0 +1,48 @@ +/** + * 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.flink.languagebinding.api.java.common; + +/** + * Container for all generic information related to operations. This class contains the absolute minimum fields that are + * required for all operations. This class should be extended to contain any additional fields required on a + * per-language basis. + */ +public abstract class OperationInfo { + public int parentID; //DataSet that an operation is applied on + public int otherID; //secondary DataSet + public int setID; //ID for new DataSet + public int[] keys1; //grouping keys + public int[] keys2; //grouping keys + public int[] projectionKeys1; //projection keys + public int[] projectionKeys2; //projection keys + public Object types; //an object that is of the same type as the output type --- End diff -- yes that would be nicer, but last time i tried that i got NotSerializableException due to the TypeInformation.
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