HHH-19052 Test case adapted from https://github.com/gaetannandelec-ibboost/hibernate6-joinsubquery

Author: cigaly

hibernate-core/src/test/java/org/hibernate/orm/test/joinsubquery/JoinSubqueryTest.java

@@ -0,0 +1,36 @@
+package org.hibernate.orm.test.joinsubquery;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+@DomainModel(annotatedClasses = {RecordItem.class, RecordType.class})
+@SessionFactory
+@JiraKey("HHH-19052")
+class JoinSubqueryTest {
+
+    @BeforeAll
+    static void setUp(SessionFactoryScope scope) throws Exception {
+        scope.inTransaction(session -> {
+            final var id = 1L;
+            final var typeId = 42L;
+            final var recordType = new RecordType(id, typeId);
+            session.persist(recordType);
+            final var item = new RecordItem(id, typeId, recordType);
+            session.persist(item);
+        });
+    }
+
+    @Test
+    void test(SessionFactoryScope scope) throws Exception {
+        scope.inSession(session -> {
+            final var item = session.get(RecordItem.class, 1L);
+            assertNotNull(item);
+        });
+    }
+}

hibernate-core/src/test/java/org/hibernate/orm/test/joinsubquery/RecordItem.java

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+package org.hibernate.orm.test.joinsubquery;
+
+import jakarta.persistence.*;
+import org.hibernate.annotations.JoinColumnOrFormula;
+import org.hibernate.annotations.JoinFormula;
+
+import java.io.Serializable;
+
+@Entity
+@Table(name = "record_items")
+public class RecordItem implements Serializable {
+
+    @Id
+    //@GeneratedValue(strategy = GenerationType.IDENTITY)
+    protected Long id;
+
+    @Column(name = "type_id", insertable = false, updatable = false)
+    private Long typeId;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumnOrFormula(column = @JoinColumn(name = "type_id", referencedColumnName = "entity_id"))
+    @JoinColumnOrFormula(formula = @JoinFormula(value = "(SELECT x.id FROM record_types x WHERE x.entity_id = type_id)", referencedColumnName = "id"))
+    private RecordType type;
+
+    RecordItem() {
+    }
+
+    public RecordItem(Long id, Long typeId, RecordType type) {
+        this.id = id;
+        this.typeId = typeId;
+        this.type = type;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return this.id;
+    }
+
+    public Long getTypeId() {
+        return typeId;
+    }
+
+    public RecordType getType() {
+        return type;
+    }
+
+
+}

hibernate-core/src/test/java/org/hibernate/orm/test/joinsubquery/RecordType.java

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+package org.hibernate.orm.test.joinsubquery;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+import java.io.Serializable;
+
+@Entity
+@Table(name = "record_types")
+public class RecordType implements Serializable {
+
+    @Id
+//    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    protected Long id;
+
+    @Column(name = "entity_id")
+    private Long entityId;
+
+    RecordType() {
+    }
+
+    public RecordType(Long id, Long entityId) {
+        this.id = id;
+        this.entityId = entityId;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return this.id;
+    }
+
+    public Long getEntityId() {
+        return entityId;
+    }
+
+    public void setEntityId(Long entityId) {
+        this.entityId = entityId;
+    }
+
+}