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Add pre-aggregates incompatibility warning for personal warehouse connections #536

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jesshitchcock merged 2 commits into from
Apr 10, 2026
Merged

Add pre-aggregates incompatibility warning for personal warehouse connections #536

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Add warning that pre-aggregates are incompatible with personal wareho…
mintlify[bot] Apr 10, 2026
61c3b4e
Simplify personal warehouse connections warning to bare bones
mintlify[bot] Apr 10, 2026
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6 changes: 6 additions & 0 deletions references/pre-aggregates/overview.mdx
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Expand Up @@ -108,6 +108,12 @@ Pre-aggregates support metrics that can be re-aggregated from pre-computed resul
- `max`
- `average`

### Personal warehouse connections

<Warning>
Pre-aggregates are **not compatible** with [personal warehouse connections](/references/workspace/personal-warehouse-connections). Materialization always runs under a single user's credentials, so warehouse-level access rules are not applied per viewer. If you rely on personal warehouse connections to enforce data access, use [results caching](/guides/developer/caching) instead.
</Warning>

### Current limitations

Not all metrics work this way. Consider `count_distinct` with the same daily pre-aggregate from above. If a daily pre-aggregate stores "2 distinct customers on 2024-01-15" and "1 distinct customer on 2024-01-16", you can't sum those to get the monthly distinct count — Alice ordered on both days and would be counted twice:
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