Commit to a Join Validation Probe
Commit to validating join cardinality before trusting an aggregate result.
Add a join validation probe before trusting a joined aggregate. a SQL query where SUM, COUNT, AVG, or COUNT(DISTINCT) runs after one or more joins I will run a probe with COUNT() AS rows_after_join, COUNT(DISTINCT __id) AS distinct_entities, and a grouped row-count check by join key before I trust the final aggregate. Probe target: __ query. Entity that must not multiply: __. Before join count: __. After join count: __. Distinct entity count after join: __. If rows_after_join > distinct_entities for a one-row-per-entity metric, I will __. An orders-to-order_lines join where order revenue might be repeated once per line item.…
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