When Microsoft started to talk about Intelligent Query Processing (IQP) before SQL Server 2017, I wasn't sure what to think. There was a diagram with 20 things on it, and only 5 were highlighted (you can see that in the article linked). That felt like something, but barely something. Over time, as we've gone through SQL Server 2019 and now 2022, the diagram now looks more filled in. In fact, now there are a lot of things filled in.
When I think about new features of SQL Server, I don't often spend a lot of time on the IQP stuff. First, I don't have to live with people yelling at me every day about slow performance. If I did, I might be more anxious to test and evaluate the changes. Second, these are mostly just hidden things that come with the product and (fingers crossed) improve my workload.
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