From d35c0602ceb86b94f7801b8a767f15c1697b7cc8 Mon Sep 17 00:00:00 2001
From: Gavin King <gavin@hibernate.org>
Date: Wed, 11 Jun 2025 08:39:57 +0200
Subject: [PATCH] implement equals() / hashCode() for
 NativeQueryConstructorTransformer

to help the query interpretation cache
---
 .../jpa/spi/NativeQueryConstructorTransformer.java | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/hibernate-core/src/main/java/org/hibernate/jpa/spi/NativeQueryConstructorTransformer.java b/hibernate-core/src/main/java/org/hibernate/jpa/spi/NativeQueryConstructorTransformer.java
index c45bda1919ef..f65b2bcb84c3 100644
--- a/hibernate-core/src/main/java/org/hibernate/jpa/spi/NativeQueryConstructorTransformer.java
+++ b/hibernate-core/src/main/java/org/hibernate/jpa/spi/NativeQueryConstructorTransformer.java
@@ -24,7 +24,7 @@
 public class NativeQueryConstructorTransformer<T> implements TupleTransformer<T> {
 
 	private final Class<T> resultClass;
-	private Constructor<T> constructor;
+	private transient Constructor<T> constructor;
 
 	private Constructor<T> constructor(Object[] elements) {
 		if ( constructor == null ) {
@@ -75,4 +75,16 @@ public T transformTuple(Object[] tuple, String[] aliases) {
 			throw new InstantiationException( "Cannot instantiate query result type", resultClass, e );
 		}
 	}
+
+	@Override
+	public boolean equals(Object obj) {
+		return obj instanceof NativeQueryConstructorTransformer<?> that
+			&& this.resultClass == that.resultClass;
+			// should be safe to ignore the cached constructor here
+	}
+
+	@Override
+	public int hashCode() {
+		return resultClass.hashCode();
+	}
 }