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Fun with Function Rewrites

Erik Darling reminds me why I hate user-defined functions in SQL Server:

At 23 seconds, this is probably unacceptable. And this is on SQL Server 2019, too. The function inlining thing doesn’t quite help us, here.

One feature restriction is this, so we uh… Yeah.

The UDF does not contain aggregate functions being passed as parameters to a scalar UDF

But we’re probably good query tuners, and we know we can write inline functions.

Read the whole thing, as this is not always straightforward.