> On Jul 27, 2020, at 4:00 PM, Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
>
> I don't quite understand why is it that a table with 1000 partitions
> means that JIT compiles the thing 1000 times. Sure, it is possible that
> some partitions have a different column layout, but it seems an easy bet
> that most cases are going to have identical column layout, and so tuple
> deforming can be shared. (I'm less sure about sharing a compile of an
> expression, since the varno would vary. But presumably there's a way to
> take the varno as an input value for the compiled expr too?) Now I
> don't actually know how this works so please correct if I misunderstand
> it.
I'm guessing it's because of inlining. You could optimize a function that takes parameters, no problem. But what's
happeningis inlining, with parameters, then optimizing.