Type: duration is used in conjunction with a dimension_group to calculate a set of interval-based duration dimensions. The form and function of the dimension group are different depending the type value of the dimension group: For example, you can specify a dimension group of type: time based on a timestamp column, and the dimension group will create corresponding dimensions to express the data in time, date, week, hour, quarter, and year. You define the dimension group, and the dimension group will create a set of individual dimensions for different intervals or timeframes. The dimension_group parameter is used to create a set of time-based or duration-based dimensions all at once.
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