hubert depesz lubaczewski <depesz@xxxxxxxxxx> writes: > On Fri, Mar 04, 2022 at 05:03:14PM -0500, Tom Lane wrote: >> Mmm ... it might have just been that the planner chose not to use >> JIT when it thought there were fewer rows involved. Did you check >> with EXPLAIN that these cut-down cases still used JIT? > I tore these boxes down, so can't check immediately, but I think > I remember that you're right - single-row queries didn't use JIT. FWIW, I went to the trouble of installing Ubuntu Focal on my raspberry pi to see if I could duplicate this, and I couldn't. However, what you get from a fresh install now is $ dpkg -l | grep libllvm ii libllvm10:arm64 1:10.0.0-4ubuntu1 arm64 Modular compiler and toolchain technologies, runtime library not 9.0.1. I also found that Fedora 31/aarch64 is still downloadable, and that does contain LLVM 9 ... and I could not reproduce it there either. So I've run out of things to try. It still seems like a bug in a specific point release of LLVM is a possible explanation, especially given that Debian went so far as to replace that release in an LTS distro. (The gcc-related packages are all exactly the same versions as you show.) I'd believe that data corruption could be a contributing factor too, except that you were able to read all the rows without JIT. regards, tom lane
