Fix for ReportQuery not fetching relationships with BatchFetch.IN

foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/queries/ReportQuery.java

@@ -933,7 +933,12 @@ public Object executeDatabaseQuery() throws DatabaseException {
             return getDescriptor().getInterfacePolicy().selectAllObjectsUsingMultipleTableSubclassRead(this);
         }
 
-        return buildObjects(getQueryMechanism().selectAllReportQueryRows());
+        List<AbstractRecord> rows = getQueryMechanism().selectAllReportQueryRows();
+        if ((this.batchFetchPolicy != null) && this.batchFetchPolicy.isIN()) {
+            this.batchFetchPolicy.setDataResults(rows);
+        }
+
+        return buildObjects((Vector) rows);
     }
 
     /**

foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/queries/ReportQueryResult.java

@@ -252,9 +252,26 @@ protected Object processItem(ReportQuery query, AbstractRecord row, Vector toMan
                 AbstractRecord subRow = row;
                 // Check if at the start of the row, then avoid building a subRow.
                 if (itemIndex > 0) {
-                    Vector<DatabaseField> trimedFields = new NonSynchronizedSubVector<>(row.getFields(), itemIndex, rowSize);
-                    Vector trimedValues = new NonSynchronizedSubVector(row.getValues(), itemIndex, rowSize);
-                    subRow = new DatabaseRecord(trimedFields, trimedValues);
+                    BatchFetchPolicy batchFetchPolicy = query.getBatchFetchPolicy();
+                    if (batchFetchPolicy != null && batchFetchPolicy.isIN()) {
+
+                        List<AbstractRecord> subRows = new ArrayList<>(toManyData.size());
+                        for (AbstractRecord parentRow : (Vector<AbstractRecord>) toManyData) {
+                            Vector<DatabaseField> trimedParentFields = new NonSynchronizedSubVector<>(parentRow.getFields(), itemIndex, rowSize);
+                            Vector trimedParentValues = new NonSynchronizedSubVector<>(parentRow.getValues(), itemIndex, rowSize);
+                            subRows.add(new DatabaseRecord(trimedParentFields, trimedParentValues));
+                        }
+
+                        for (DatabaseMapping subMapping : descriptor.getMappings()) {
+                            batchFetchPolicy.setDataResults(subMapping, subRows);
+                        }
+
+                        subRow = subRows.get(toManyData.indexOf(row));
+                    } else {
+                        Vector<DatabaseField> trimedFields = new NonSynchronizedSubVector<>(row.getFields(), itemIndex, rowSize);
+                        Vector trimedValues = new NonSynchronizedSubVector(row.getValues(), itemIndex, rowSize);
+                        subRow = new DatabaseRecord(trimedFields, trimedValues);
+                    }
                 }
                 if (mapping != null && mapping.isAggregateObjectMapping()){
                     value = ((AggregateObjectMapping)mapping).buildAggregateFromRow(subRow, null, null, joinManager, query, false, query.getSession(), true);

jpa/eclipselink.jpa.testapps/jpa.test.batchfetch/pom.xml

@@ -0,0 +1,82 @@
+<!--
+
+    Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved.
+
+    This program and the accompanying materials are made available under the
+    terms of the Eclipse Public License v. 2.0 which is available at
+    http://www.eclipse.org/legal/epl-2.0,
+    or the Eclipse Distribution License v. 1.0 which is available at
+    http://www.eclipse.org/org/documents/edl-v10.php.
+
+    SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>org.eclipse.persistence.jpa.testapps</artifactId>
+        <groupId>org.eclipse.persistence</groupId>
+        <version>5.0.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>org.eclipse.persistence.jpa.testapps.batchfetch</artifactId>
+
+    <name>Test - batchfetch</name>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <!--Resolve dependencies into Maven properties like ${org.eclipse.persistence:org.eclipse.persistence.jpa:jar} for JPA module-->
+                    <execution>
+                        <id>get-test-classpath-to-properties</id>
+                        <phase>process-test-classes</phase>
+                    </execution>
+                </executions>
+            </plugin>
+            <!-- start/stop in-memory derby before/after the test -->
+            <plugin>
+                <groupId>org.carlspring.maven</groupId>
+                <artifactId>derby-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>start-derby</id>
+                        <phase>process-test-classes</phase>
+                    </execution>
+                    <execution>
+                        <id>stop-derby</id>
+                        <phase>prepare-package</phase>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>default-test</id>
+                        <configuration>
+                            <!-- turn on dynamic weaving -->
+                            <argLine>-javaagent:${org.eclipse.persistence:org.eclipse.persistence.jpa:jar}</argLine>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>server-test</id>
+                        <configuration>
+                            <!-- exclude some tests from server-side run -->
+                            <excludes>
+                                <exclude>**/EntityManagerImplTest</exclude>
+                                <exclude>**/EntityManagerFactoryImplTest</exclude>
+                            </excludes>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

jpa/eclipselink.jpa.testapps/jpa.test.batchfetch/src/main/java/org/eclipse/persistence/jpa/testapps/batchfetch/BatchFetchTableCreator.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+// Contributors:
+
+package org.eclipse.persistence.jpa.testapps.batchfetch;
+
+import org.eclipse.persistence.tools.schemaframework.FieldDefinition;
+import org.eclipse.persistence.tools.schemaframework.TableCreator;
+import org.eclipse.persistence.tools.schemaframework.TableDefinition;
+
+public class BatchFetchTableCreator extends TableCreator {
+    public BatchFetchTableCreator() {
+        setName("BatchFetchProject");
+
+        addTableDefinition(buildCompanyTable());
+        addTableDefinition(buildEmployeeTable());
+        addTableDefinition(buildRecordTable());
+    }
+
+    public TableDefinition buildRecordTable() {
+        TableDefinition table = new TableDefinition();
+        table.setName("BATCH_IN_RECORD");
+
+        FieldDefinition fieldID = new FieldDefinition();
+        fieldID.setName("ID");
+        fieldID.setTypeName("NUMBER");
+        fieldID.setSize(19);
+        fieldID.setSubSize(0);
+        fieldID.setIsPrimaryKey(true);
+        fieldID.setIsIdentity(true);
+        fieldID.setShouldAllowNull(false);
+        table.addField(fieldID);
+
+        FieldDefinition fieldUSER = new FieldDefinition();
+        fieldUSER.setName("EMPLOYEE_ID");
+        fieldUSER.setTypeName("NUMBER");
+        fieldUSER.setSize(19);
+        fieldUSER.setSubSize(0);
+        fieldUSER.setIsPrimaryKey(false);
+        fieldUSER.setIsIdentity(false);
+        fieldUSER.setShouldAllowNull(false);
+        fieldUSER.setForeignKeyFieldName("BATCH_IN_EMPLOYEE.ID");
+        table.addField(fieldUSER);
+
+        return table;
+    }
+
+    public TableDefinition buildCompanyTable() {
+        TableDefinition table = new TableDefinition();
+        table.setName("BATCH_IN_COMPANY");
+
+        FieldDefinition fieldID = new FieldDefinition();
+        fieldID.setName("ID");
+        fieldID.setTypeName("NUMBER");
+        fieldID.setSize(19);
+        fieldID.setSubSize(0);
+        fieldID.setIsPrimaryKey(true);
+        fieldID.setIsIdentity(true);
+        fieldID.setShouldAllowNull(false);
+        table.addField(fieldID);
+
+        return table;
+    }
+
+
+    public TableDefinition buildEmployeeTable() {
+        TableDefinition table = new TableDefinition();
+        table.setName("BATCH_IN_EMPLOYEE");
+
+        FieldDefinition fieldID = new FieldDefinition();
+        fieldID.setName("ID");
+        fieldID.setTypeName("NUMBER");
+        fieldID.setSize(19);
+        fieldID.setSubSize(0);
+        fieldID.setIsPrimaryKey(true);
+        fieldID.setIsIdentity(true);
+        fieldID.setShouldAllowNull(false);
+        table.addField(fieldID);
+
+        FieldDefinition fieldCompany = new FieldDefinition();
+        fieldCompany.setName("COMPANY_ID");
+        fieldCompany.setTypeName("NUMBER");
+        fieldCompany.setSize(19);
+        fieldCompany.setSubSize(0);
+        fieldCompany.setIsPrimaryKey(false);
+        fieldCompany.setIsIdentity(false);
+        fieldCompany.setShouldAllowNull(false);
+        fieldCompany.setForeignKeyFieldName("BATCH_IN_COMPANY.ID");
+        table.addField(fieldCompany);
+
+        return table;
+
+    }
+
+}

jpa/eclipselink.jpa.testapps/jpa.test.batchfetch/src/main/java/org/eclipse/persistence/jpa/testapps/batchfetch/Company.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+// Contributors:
+
+package org.eclipse.persistence.jpa.testapps.batchfetch;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+import org.eclipse.persistence.annotations.BatchFetch;
+import org.eclipse.persistence.annotations.BatchFetchType;
+
+import java.util.List;
+
+@Entity
+@Table(name = "BATCH_IN_COMPANY")
+public class Company {
+    @Id
+    private long id;
+
+    public Company() {
+    }
+
+    public Company(long id) {
+        this.id = id;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+}

jpa/eclipselink.jpa.testapps/jpa.test.batchfetch/src/main/java/org/eclipse/persistence/jpa/testapps/batchfetch/Count.java

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+// Contributors:
+
+package org.eclipse.persistence.jpa.testapps.batchfetch;
+
+public record Count(long value, Employee employee) {}

jpa/eclipselink.jpa.testapps/jpa.test.batchfetch/src/main/java/org/eclipse/persistence/jpa/testapps/batchfetch/Employee.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+// Contributors:
+
+package org.eclipse.persistence.jpa.testapps.batchfetch;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import org.eclipse.persistence.annotations.BatchFetch;
+import org.eclipse.persistence.annotations.BatchFetchType;
+
+@Entity
+@Table(name = "BATCH_IN_EMPLOYEE")
+public class Employee {
+    @Id
+    private long id;
+
+    @ManyToOne(fetch = FetchType.EAGER)
+    @JoinColumn(name = "COMPANY_ID")
+    @BatchFetch(value = BatchFetchType.IN)
+    private Company company;
+
+    public Employee() {
+    }
+
+    public Employee(long id, Company company) {
+        this.id = id;
+        this.company = company;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public Company getCompany() {
+        return company;
+    }
+
+    public void setCompany(Company company) {
+        this.company = company;
+    }
+}