关于“Creating Derived Tables with LookML”的评价

There is a warning on the last task and I've no idea how to fix it. No trigger mechanism for datagroup training_ecommerce_default_datagroup in model training_ecommerce declared as datagroup_trigger. Regeneration of table user_order_summary will not be automatically triggered user_order_summary.view:6 training_ecommerce:order_items

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nice!

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