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Re:PostgreSQL 12 by yxhuvud on Thursday October 03, 2019 @04:26PM (#21151765)
> JIT enabled by default.

Only if you actually happened to compile the support for it, which is not the default.

Re:PostgreSQL 12 by pgaddict on Friday October 04, 2019 @08:09AM (#21156769)
Depends on packaging. Most distros should have that compiled as a separate package, e.g. postgresql12-llvmjit. So you install that (along with the regular packages) and you'll have JIT.