LuciferYang commented on code in PR #43796:
URL: https://github.com/apache/spark/pull/43796#discussion_r1777165654
##########
sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/aggregate/Aggregation.java:
##########
@@ -28,16 +28,7 @@
* @since 3.2.0
*/
@Evolving
-public final class Aggregation implements Serializable {
- private final AggregateFunc[] aggregateExpressions;
- private final Expression[] groupByExpressions;
-
- public Aggregation(AggregateFunc[] aggregateExpressions, Expression[]
groupByExpressions) {
- this.aggregateExpressions = aggregateExpressions;
- this.groupByExpressions = groupByExpressions;
- }
-
- public AggregateFunc[] aggregateExpressions() { return aggregateExpressions;
}
-
- public Expression[] groupByExpressions() { return groupByExpressions; }
+public record Aggregation(
Review Comment:
I wrote the following test code relying on Spark 3.5.3:
```java
package org.apache.spark.sql.catalyst.expressions;
import org.apache.spark.sql.connector.expressions.aggregate.Aggregation;
import org.apache.spark.sql.connector.expressions.Expression;
import org.apache.spark.sql.connector.expressions.aggregate.CountStar;
import java.util.Arrays;
public class AggregationTest {
public void testCompatibility() {
CountStar star = new CountStar();
Aggregation aggregation =
new Aggregation(new CountStar[]{star},
Expression.EMPTY_EXPRESSION);
System.out.println(Arrays.toString(aggregation.aggregateExpressions()));
System.out.println(Arrays.toString(aggregation.groupByExpressions()));
System.out.println(aggregation.hashCode());
}
}
```
And I compiled it using Java 8, then invoked this code on 4.0.0-preview1:
```
bin/spark-shell --master local
WARNING: Using incubator modules: jdk.incubator.vector
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 4.0.0-preview1
/_/
Using Scala version 2.13.14 (OpenJDK 64-Bit Server VM, Java 17.0.12)
Type in expressions to have them evaluated.
Type :help for more information.
Spark context Web UI available at http://192.168.43.26:4040
Spark context available as 'sc' (master = local, app id =
local-1727359585773).
Spark session available as 'spark'.
scala> val aggTest = new
org.apache.spark.sql.catalyst.expressions.AggregationTest()
val aggTest: org.apache.spark.sql.catalyst.expressions.AggregationTest =
org.apache.spark.sql.catalyst.expressions.AggregationTest@7689b31
scala> aggTest.testCompatibility
[COUNT(*)]
[]
-2108932933
```
The old code can be executed in 4.0 without recompilation, so I think this
is binary compatible.
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