docs: clarify dimension interaction with distinct_keys#654
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Summary
Documents how selected dimensions interact with
distinct_keysfor thesum_distinctandaverage_distinctmetric types, reflecting the updated semantics where deduplication is always performed globally ondistinct_keysregardless of which dimensions are selected (matching Looker's behavior).Changes
distinct_keys" subsection undersum_distinctinreferences/metrics.mdx, explaining:distinct_keysgroup the metric (one deduplicated value per group).distinct_keysdo not affect dedup; the global deduplicated value is repeated across rows.distinct_keysif you want a per-group total.average_distinctsection.Context
Source PR updates
sum_distinct/average_distinctto deduplicate globally ondistinct_keysrather than partitioning by the user-selected dimensions, which previously produced per-group sums and obscured the global deduplicated total when the selected dimension was orthogonal to thedistinct_keysgrain.