HHH-15527 Test that only a single query is executed when running an insert-select with an assigned id

hibernate-core/src/test/java/org/hibernate/orm/test/query/hql/InsertSelectTests.java

@@ -0,0 +1,48 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.query.hql;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.jdbc.SQLStatementInspector;
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.ServiceRegistry;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+
+@ServiceRegistry
+@DomainModel( annotatedClasses = {
+		InsertSelectTests.EntityEntry.class
+})
+@SessionFactory(statementInspectorClass = SQLStatementInspector.class)
+public class InsertSelectTests {
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-15527")
+	public void testInsertSelectGeneratedAssigned(SessionFactoryScope scope) {
+		final SQLStatementInspector statementInspector = (SQLStatementInspector) scope.getStatementInspector();
+		scope.inTransaction(
+				session -> {
+					statementInspector.clear();
+					session.createMutationQuery("insert into EntityEntry (id, name) select 1, 'abc' from EntityEntry e").executeUpdate();
+					statementInspector.assertExecutedCount( 1 );
+				}
+		);
+	}
+
+	@Entity(name = "EntityEntry")
+	public static class EntityEntry {
+		@Id
+		@GeneratedValue
+		Integer id;
+		String name;
+	}
+}