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This operator, proposed in Agrawal, Gupta, & Sarawagi (1997), is used to convert dimensions into elements that can then be manipulated using the combining function felem. This its a typical operator useful in OLAP application in order to allow dimensions and measures to be treated uniformly. An example (taken from Agrawal, Gupta, & Sarawagi, 1997) is shown in Figure 19.
Figure 19
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