@Test
public void testGetTaskInstancesAsPotOwners() {

    String PO_TASK_QUERY = "select ti.taskId, ti.activationTime, ti.actualOwner, ti.createdBy, ti.createdOn, ti.deploymentId, " + "ti.description, ti.dueDate, ti.name, ti.parentId, ti.priority, ti.processId, ti.processInstanceId, " + "ti.processSessionId, ti.status, ti.workItemId, oe.id, eo.entity_id " + "from AuditTaskImpl ti " + "left join PeopleAssignments_PotOwners po on ti.taskId = po.task_id " + "left join OrganizationalEntity oe on po.entity_id = oe.id " + " left join PeopleAssignments_ExclOwners eo on ti.taskId = eo.task_id ";
    SqlQueryDefinition query = new SqlQueryDefinition("getMyTaskInstances", "jdbc/testDS1", Target.PO_TASK);
    query.setExpression(PO_TASK_QUERY);
    queryService.registerQuery(query);
    List<QueryDefinition> queries = queryService.getQueries(new QueryContext());
    assertNotNull(queries);
    assertEquals(1, queries.size());
    QueryDefinition registeredQuery = queries.get(0);
    assertNotNull(registeredQuery);
    assertEquals(query.getName(), registeredQuery.getName());
    assertEquals(query.getSource(), registeredQuery.getSource());
    assertEquals(query.getExpression(), registeredQuery.getExpression());
    assertEquals(query.getTarget(), registeredQuery.getTarget());
    registeredQuery = queryService.getQuery(query.getName());
    assertNotNull(registeredQuery);
    assertEquals(query.getName(), registeredQuery.getName());
    assertEquals(query.getSource(), registeredQuery.getSource());
    assertEquals(query.getExpression(), registeredQuery.getExpression());
    assertEquals(query.getTarget(), registeredQuery.getTarget());
    Map<String, Object> params = new HashMap<String, Object>();
    params.put("approval_document", "initial content");
    processInstanceId = processService.startProcess(deploymentUnit.getIdentifier(), "org.jbpm.writedocument", params);
    assertNotNull(processInstanceId);
    identityProvider.setName("notvalid");
    List<UserTaskInstanceDesc> taskInstanceLogs = queryService.query(query.getName(), UserTaskInstanceQueryMapper.get(), new QueryContext());
    assertNotNull(taskInstanceLogs);
    assertEquals(0, taskInstanceLogs.size());
    identityProvider.setName("salaboy");
    taskInstanceLogs = queryService.query(query.getName(), UserTaskInstanceQueryMapper.get(), new QueryContext());
    assertNotNull(taskInstanceLogs);
    assertEquals(1, taskInstanceLogs.size());
    List<TaskSummary> taskSummaries = queryService.query(query.getName(), TaskSummaryQueryMapper.get(), new QueryContext());
    assertNotNull(taskSummaries);
    assertEquals(1, taskSummaries.size());
    
    identityProvider.setName("Administrator");
    userTaskAdminService.addPotentialOwners(taskSummaries.get(0).getId(), false, factory.newUser("john"));
    identityProvider.setName("salaboy");
    
    taskInstanceLogs = queryService.query(query.getName(), UserTaskInstanceQueryMapper.get(), new QueryContext());
    assertNotNull(taskInstanceLogs);
    assertEquals(1, taskInstanceLogs.size());
    taskSummaries = queryService.query(query.getName(), TaskSummaryQueryMapper.get(), new QueryContext());
    assertNotNull(taskSummaries);
    assertEquals(1, taskSummaries.size());
    
    QueryParam[] parameters = QueryParam.getBuilder().append(QueryParam.groupBy(COLUMN_NAME)).append(QueryParam.count(COLUMN_TASKID)).get();
    Collection<List<Object>> instances = queryService.query(query.getName(), RawListQueryMapper.get(), new QueryContext(), parameters);
    assertNotNull(instances);
    assertEquals(1, instances.size());
    
    List<Object> result = instances.iterator().next();
    assertNotNull(result);
    assertEquals(2, result.size());
    // here we have count set to 2 because group by is on name and thus it returns duplicates
    assertTrue(result.get(1) instanceof Number);
    assertEquals(2, ((Number) result.get(1)).intValue());
    processService.abortProcessInstance(processInstanceId);
    processInstanceId = null;
}