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 java.io.Serializable;
+
+import org.hibernate.annotations.JoinColumnOrFormula;
+import org.hibernate.annotations.JoinFormula;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "record_items")
+public class RecordItem implements Serializable {
+
+	@Id
+	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 java.io.Serializable;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "record_types")
+public class RecordType implements Serializable {
+
+	@Id
+	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;
+	}
+
+}