[hibernate-issues] [JIRA] (HHH-16157) Query with join fetch on collection of entities with @DiscriminatorValue causes duplicate condition

Marco Belladelli ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=637b480... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYjYzY2QwYmVi... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16157?atlOrigin=eyJpIjoiYjYzY2... ) HHH-16157 ( https://hibernate.atlassian.net/browse/HHH-16157?atlOrigin=eyJpIjoiYjYzY2... ) Query with join fetch on collection of entities with @DiscriminatorValue causes duplicate condition ( https://hibernate.atlassian.net/browse/HHH-16157?atlOrigin=eyJpIjoiYjYzY2... ) Issue Type: Bug Affects Versions: 6.2.0.CR2 Assignee: Marco Belladelli ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=637b480... ) Created: 09/Feb/2023 06:16 AM Priority: Minor Reporter: Marco Belladelli ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=637b480... ) If a @OneToMany association with an Entity which has a @DiscriminatorValue is retrieved through a join fetch query the discriminator condition will be duplicated in the generated SQL. Here is a mapping example: @Entity(name = "Person" ) public class Person { @OneToMany(fetch = FetchType.LAZY, mappedBy = "person" ) private Set<Leg> legs = new HashSet<>(); } @Entity(name = "BodyPart" ) @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorColumn(name = "discriminator" ) public abstract class BodyPart { } @Entity(name = "Leg" ) @DiscriminatorValue( "LegBodyPart" ) public class Leg extends BodyPart { @ManyToOne(optional = false ) private Person person; } Querying with the following JPQL: select person from Person person left join fetch person.legs as legs Will produce a SQL select with the duplicated condition: select p1_0.id, l1_0.person_id, l1_0.id, l1_0. name , p1_0. name from person p1_0 left join body_part l1_0 on p1_0.id=l1_0.person_id and l1_0.discriminator= 'LegBodyPart' and l1_0.discriminator= 'LegBodyPart' ( https://hibernate.atlassian.net/browse/HHH-16157#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16157#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#100215- sha1:a0f3b6a )