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[SPARK-47331][SS] Serialization using case classes/primitives/POJO ba…
…sed on SQL encoder for Arbitrary State API v2 ### What changes were proposed in this pull request? In the new operator for arbitrary state-v2, we cannot rely on the session/encoder being available since the initialization for the various state instances happens on the executors. Hence, for the state serialization, we propose to let user explicitly pass in encoder for state variable and serialize primitives/case classes/POJO with SQL encoder. Leveraging SQL encoder can speed up the serialization. ### Why are the changes needed? These changes are needed for providing a dedicated serializer for state-v2. The changes are part of the work around adding new stateful streaming operator for arbitrary state mgmt that provides a bunch of new features listed in the SPIP JIRA here - https://issues.apache.org/jira/browse/SPARK-45939 ### Does this PR introduce _any_ user-facing change? Users will need to specify the SQL encoder for their state variable: `def getValueState[T](stateName: String, valEncoder: Encoder[T]): ValueState[T]` `def getListState[T](stateName: String, valEncoder: Encoder[T]): ListState[T]` For primitive type, Encoder is something as: `Encoders.scalaLong`; for case class, `Encoders.product[CaseClass]`; for POJO, `Encoders.bean(classOf[POJOClass])` ### How was this patch tested? Unit tests for primitives, case classes, POJO separately in `ValueStateSuite` ### Was this patch authored or co-authored using generative AI tooling? No Closes apache#45447 from jingz-db/sql-encoder-state-v2. Authored-by: jingz-db <jing.zhan@databricks.com> Signed-off-by: Jungtaek Lim <kabhwan.opensource@gmail.com>
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sql/core/src/test/java/org/apache/spark/sql/execution/streaming/state/POJOTestClass.java
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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. | ||
| */ | ||
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| package org.apache.spark.sql.execution.streaming.state; | ||
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| /** | ||
| * A POJO class used for tests of arbitrary state SQL encoder. | ||
| */ | ||
| public class POJOTestClass { | ||
| // Fields | ||
| private String name; | ||
| private int id; | ||
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| // Constructors | ||
| public POJOTestClass() { | ||
| // Default constructor | ||
| } | ||
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| public POJOTestClass(String name, int id) { | ||
| this.name = name; | ||
| this.id = id; | ||
| } | ||
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| // Getter methods | ||
| public String getName() { | ||
| return name; | ||
| } | ||
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| public int getId() { | ||
| return id; | ||
| } | ||
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| // Setter methods | ||
| public void setName(String name) { | ||
| this.name = name; | ||
| } | ||
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| public void setId(int id) { | ||
| this.id = id; | ||
| } | ||
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| // Additional methods if needed | ||
| public void incrementId() { | ||
| id++; | ||
| System.out.println(name + " is now " + id + "!"); | ||
| } | ||
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| // Override toString for better representation | ||
| @Override | ||
| public String toString() { | ||
| return "POJOTestClass{" + | ||
| "name='" + name + '\'' + | ||
| ", age=" + id + | ||
| '}'; | ||
| } | ||
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| // Override equals and hashCode for custom equality | ||
| @Override | ||
| public boolean equals(Object obj) { | ||
| POJOTestClass testObj = (POJOTestClass) obj; | ||
| return id == testObj.id && name.equals(testObj.name); | ||
| } | ||
| } | ||
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