docs: clarify global deduplication for sum_distinct and average_distinct#648
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Summary
Clarify that
sum_distinctandaverage_distinctalways deduplicate globally ondistinct_keys, regardless of which dimensions a user selects in a query.Changes
sum_distinctexplaining that the deduplicated total is global and is repeated across every output row; per-group results require adding the grouping field todistinct_keys.average_distinct.Context
Triggered by an upstream fix that restores global deduplication semantics for
sum_distinct/average_distinct(matching Looker's behavior). Previously, the metric could appear to partition by selected dimensions when those dimensions were orthogonal to thedistinct_keysgrain, obscuring the global total. This note documents the user-visible behavior so users know how to choosedistinct_keysfor the result they want.