Guaranteeing order per user_id across partitions

Prefer a staging table plus validation gate before promoting to prod tables.

Prefer a staging table plus validation gate before promoting to prod tables.

Start with the execution plan, numbers beat guesses.

Could you share a sketch of the salting logic?

Prefer a staging table plus validation gate before promoting to prod tables.

Document the grain decision, most BI bugs turn out to be grain bugs.

We saw the same issue, fixing the partition filter dropped runtime 60%.

Prefer a staging table plus validation gate before promoting to prod tables.

Another path: push the compute to the warehouse if the data's already there.

Careful with NULL in join keys, they'll drop rows in an inner join.

Sometimes the real fix is a product change so you stop needing that join at all.

Agree on the staging table swap. Atomic promote prevented partial reads.