implement equals() / hashCode() for NativeQueryConstructorTransformer

to help the query interpretation cache

Author: gavinking

hibernate-core/src/main/java/org/hibernate/jpa/spi/NativeQueryConstructorTransformer.java

@@ -20,7 +20,7 @@
 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 ) {
@@ -71,4 +71,16 @@ 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();
+	}
 }