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a7ee2bbbd8
Currently, progress of a parent task depends on expected_total_workload, expected_children_number, and children progresses. Basically, if total workload is known or all children have already been created, progresses of children are summed up. Otherwise binary progress is returned. As a result, two tasks of the same type may return progress in different units. If they are children of the same task and this parent gathers the progress - it becomes meaningless. Drop expected_children_number as we can't assume that children are able to show their progresses. Modify get_progress method - progress is calculated based on children progresses. If expected_total_workload isn't specified, the total progress of a task may grow. If expected_total_workload isn't specified and no children are created, empty progress (0/0) is returned. Fixes: https://github.com/scylladb/scylladb/issues/24650. Closes scylladb/scylladb#25113