What version of postgres is lfgss on? Pre 9.6 wasn't multithreaded, and pre 12, CTEs (and sub queries?) were basically optimisation fences.
If a DISTINCT ON causes performance issues, upgrading postgres could be a solution
At this point in time I may have to admit it's an old PostgreSQL version.
If anyone is extremely comfortable with upgrading Postgres please let me know, would love to get us to latest stable.
We are on 9.2 with the ltree module installed.
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What version of postgres is lfgss on? Pre 9.6 wasn't multithreaded, and pre 12, CTEs (and sub queries?) were basically optimisation fences.
If a DISTINCT ON causes performance issues, upgrading postgres could be a solution