Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/3838#discussion_r121900972
--- Diff:
flink-libraries/flink-streaming-python/src/main/java/org/apache/flink/streaming/python/util/serialization/PythonSerializationSchema.java
---
@@ -0,0 +1,53 @@
+/*
+ * 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.streaming.python.util.serialization;
+
+import java.io.IOException;
+
+import org.apache.flink.streaming.util.serialization.SerializationSchema;
+import org.python.core.PyObject;
+
+/**
+ * A Python serialization schema, which implements {@link
SerializationSchema}. It converts
+ * a {@code PyObject} into its serialized form.
+ */
+public class PythonSerializationSchema implements
SerializationSchema<PyObject> {
+ private static final long serialVersionUID = -9170596504893036458L;
+
+ private final byte[] serSchema;
+ private transient SerializationSchema<PyObject> schema;
+
+ public PythonSerializationSchema(SerializationSchema<PyObject> schema)
throws IOException {
+ this.serSchema = SerializationUtils.serializeObject(schema);
+ }
+
+ @Override
+ @SuppressWarnings("unchecked")
+ public byte[] serialize(PyObject element) {
+ if (this.schema == null) {
+ try {
+ this.schema =
(SerializationSchema<PyObject>)SerializationUtils.deserializeObject(this.serSchema);
+ } catch (IOException e) {
+ e.printStackTrace();
--- End diff --
we should fail right here, as otherwise we get an NPE later on anyway.
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