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A data engineer has a streaming job that updates a Delta table named ‘user_activities’ by the results of a join between a streaming Delta table ‘activity_logs’ and a static Delta table ‘users’. They noticed that adding new users into the ‘users’ table does not automatically trigger updates to the ‘user_activities’ table, even when there were activities for those users in the ‘activity_logs’ table. Which of the following likely explains this issue ?