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GEQO is not to get a better plan than the traditional optimizer, it is to be able to get a plan at all when the query is large. And it's widely known for creating poor plans.

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Yes, but it's exactly the kind of hybrid between a regular planner and something generative (writ broadly) that they were asking about. Practically speaking if you're hitting the GEQO you've already failed as a query writer unless it's a purely OLAP on a dedicated beefy machine.

I think calling GEQO generative is a bit of a stretch; it's just a different way of searching through the same space with the same cost model. More or less devolving to “let's take a bunch of randomized join orders and see which one is best” :-)

And yes, large joins is definitely for OLAP use. If you have 20-way joins for OLTP, you're either crazy or you're using an ORM.

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