3161198 - How do I get a distinct count of a field using SiGNAL?

We are working on a PI investigation and wanted to know, is it possible to get distinct count of an Event level attribute using SiGNAL?

To get the distinct values of an event level attribute you can write:

SELECT DISTINCT event_attribute
FROM FLATTEN(THIS_PROCESS)

The client will inject the chapter and widget filters into the correct place now.

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