How can I get all unassigned historic task Instances, in other words, all tasks where ‘assignee_’ in table ACT_HI_TASKINST is null?
I tried using org.flowable.task.api.history.HistoricTaskInstanceQuery. There is the method taskAssignee(Sting) there, I tried passing null to it, but it does not work.
There is a ‘taskUnassigned()’ method in org.flowable.task.api.TaskQuery, but I am not sure if I can use it together with HistoricTaskInstanceQuery. It would be nice if the latter also had such a method.