[hibernate-issues] [JIRA] (HHH-17065) Column ordering leads to wrong column order in composite primary keys

Benedikt Waldvogel ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiODk3YWVjYjRh... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-17065?atlOrigin=eyJpIjoiODk3YW... ) HHH-17065 ( https://hibernate.atlassian.net/browse/HHH-17065?atlOrigin=eyJpIjoiODk3YW... ) Column ordering leads to wrong column order in composite primary keys ( https://hibernate.atlassian.net/browse/HHH-17065?atlOrigin=eyJpIjoiODk3YW... ) Change By: Benedikt Waldvogel ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Note: This issue is very similar to [https://hibernate.atlassian.net/browse/HHH-16943|https://hibernate.atlass...] but the same problem happens for *composite primary keys*. h2. Given {code:java}@Entity @IdClass( CompositePrimaryKey.class ) static class TestEntity { @Id private String b; @Id private String a; } private static class CompositePrimaryKey { private String b; private String a; // getters, setters, hashCode, equals }{code} Note that we define the composite primary key on the columns *(b, a)* (in that very order). The column order could be important since the underlying primary key index should be used to speed-up queries that select all entities for a given value of “b”. h2. Actual vs. Expected When the schema gets created in the context of a JPA EntityManagerFactory, the columns are (re-)ordered during construction of the [SessionFactoryImpl, Line 252: bootMetamodel.orderColumns( false )|https://github.com/hibernate/hibernate-orm/blob/58aff00957721074a4a3937256edd64a067bc943/hibernate-core/src/main/java/org/hibernate/internal/SessionFactoryImpl.java#L252] This leads to the following DDL: {code:sql}create table "TestEntity" ( a varchar(255) not null, b varchar(255) not null, primary key (a, b) ){code} Note that the primary key is created for {color:#bf2600}*(a, b)*{color} instead of the expected column order *(b, a)*. h2. Workaround One can restore the behavior of Hibernate 6.1 by switching to the legacy column ordering strategy via {{hibernate.column_ordering_strategy=legacy}}. h2. Test Case _Upcoming…_ [https://github.com/hibernate/hibernate-orm/pull/7160|https://github.com/h...] ( https://hibernate.atlassian.net/browse/HHH-17065#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-17065#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100234- sha1:90f5128 )