A PostgreSQL planner semi-join gotcha with CTE, LIMIT, and RETURNING
(shayon.dev)
I recently discovered an unexpected behavior in PostgreSQL involving a pattern of using a Common Table Expression (CTE) with DELETE ... RETURNING and LIMIT to process a batch of items from a queue-like table. What seemed straightforward turned out to have a surprising interaction with the query planner.
I recently discovered an unexpected behavior in PostgreSQL involving a pattern of using a Common Table Expression (CTE) with DELETE ... RETURNING and LIMIT to process a batch of items from a queue-like table. What seemed straightforward turned out to have a surprising interaction with the query planner.