Method checkTaskError

bolt/exec/tests/utils/Cursor.cpp:371–385

 private:
  void checkTaskError() {
    if (!task_->error()) {
      return;
    }
    // Wait for the task to finish (there's' a small period of time between
    // when the error is set on the Task and terminate is called).
    task_->taskCompletionFuture()
        .within(std::chrono::microseconds(5'000'000))
        .wait();

    // Wait for all task drivers to finish to avoid destroying the executor_
    // before task_ finished using it and causing a crash.
    waitForTaskDriversToFinish(task_.get());
    std::rethrow_exception(task_->error());
  }

  const int32_t maxDrivers_;
  const int32_t numConcurrentSplitGroups_;