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https://issues.apache.org/jira/browse/SPARK-38823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon reassigned SPARK-38823:
------------------------------------
Assignee: Bruce Robbins
> Incorrect result of dataset reduceGroups in java
> ------------------------------------------------
>
> Key: SPARK-38823
> URL: https://issues.apache.org/jira/browse/SPARK-38823
> Project: Spark
> Issue Type: Bug
> Components: Java API
> Affects Versions: 3.3.0, 3.4.0
> Reporter: IKozar
> Assignee: Bruce Robbins
> Priority: Major
> Labels: correctness
>
> {code:java}
> @Data
> @NoArgsConstructor
> @AllArgsConstructor
> public static class Item implements Serializable {
> private String x;
> private String y;
> private int z;
> public Item addZ(int z) {
> return new Item(x, y, this.z + z);
> }
> } {code}
> {code:java}
> List<Item> items = List.of(
> new Item("X1", "Y1", 1),
> new Item("X2", "Y1", 1),
> new Item("X1", "Y1", 1),
> new Item("X2", "Y1", 1),
> new Item("X3", "Y1", 1),
> new Item("X1", "Y1", 1),
> new Item("X1", "Y2", 1),
> new Item("X2", "Y1", 1));
> Dataset<Item> ds = spark.createDataFrame(items,
> Item.class).as(Encoders.bean(Item.class));
> ds.groupByKey((MapFunction<Item, Tuple2<String, String>>) item ->
> Tuple2.apply(item.getX(), item.getY()),
> Encoders.tuple(Encoders.STRING(), Encoders.STRING()))
> .reduceGroups((ReduceFunction<Item>) (item1, item2) ->
> item1.addZ(item2.getZ()))
> .show(10);
> {code}
> result is
> {noformat}
> +--------+----------------------------------------------+
> | key|ReduceAggregator(poc.job.JavaSparkReduce$Item)|
> +--------+----------------------------------------------+
> |{X1, Y1}| {X2, Y1, 2}|-- expected 3
> |{X2, Y1}| {X2, Y1, 2}|-- expected 3
> |{X1, Y2}| {X2, Y1, 1}|
> |{X3, Y1}| {X2, Y1, 1}|
> +--------+----------------------------------------------+{noformat}
> pay attention that key doesn't mach with value
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