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Neki implements Postgres sequence semantics across shards

planetscale.com by Mats Rydberg 13 min read Editor score 7/10

The piece examines how PlanetScale’s sharded Postgres system handles volatile expressions and synchronous evaluation across shards to match native Postgres sequences. These semantics matter when adapting familiar database behavior to distributed query planning and execution.

What: Neki, PlanetScale’s sharded Postgres, implements sequences to match native Postgres semantics across its sharded system.
How: In general query planning, shards return raw rows to a router, which concatenates the rowsets and returns the full result to the client.
Why it matters: Distributed query planning must account for SQL semantics and data topology; sequence handling is a case where the excerpt says centralized control is needed.

In the general query-planning case, shards return rows to the router, which assembles the client result. Sketched from the article's own text.

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