Add CountDistinct finisher - #1478
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Closes #1386.
Adds a
CountDistinctfinisher next to the existingCount, so you can runCOUNT(DISTINCT column)without dropping down to a raw query.The query builder already supports combining count with a distinct expression (it renders
COUNT(DISTINCT (col))), so the generated method just sets select/count/distinct and scans the result. It also generates the usual G/GP/P variants and a test that mirrors the existing Count test.