Description of problem: Just-in-Time Compilation (JIT) for PostgreSQL is already available in v11: https://www.postgresql.org/docs/12/jit.html The upstream spec file includes a sub-package llvmjit for this. I believe it would be great to have this feature enabled for the PostgreSQL in Fedora.
This would be interesting to investigate together with the PostgreSQL 12 inclusion.
This doesn't seem to be in RAWHIDE, yet. Can you cite the commit?
Pull-request that adds this feature: https://src.fedoraproject.org/rpms/postgresql/pull-request/19