Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/202#discussion_r23958310
--- 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 --
transient field is a good idea...
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