Document registering externally-built pre-aggregation tables#2344
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Adds a section to the aggregate-awareness page covering how to register tables built by outside ETL pipelines (REST and declarative YAML), the measure-only column-mapping rule, separate freshness reporting via the availability endpoint, the external materialization-strategy guard, and current registration limitations. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds a "Mapping dimension columns" section (physical-column binding for grain/dimension references, joined-attribute-read-directly behavior, validation) now that the feature is merged, and updates the stale "only measure columns are validated" limitation. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Adds a section to the aggregate-awareness page covering how to register tables built by outside ETL pipelines (REST and declarative YAML), the measure-only column-mapping rule, separate freshness reporting via the availability endpoint, the external materialization-strategy guard, and current registration limitations.
Test Plan
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