Re: wrong query result with jit_above_cost= 0

Hi,

On 2018-07-22 17:09:37 -0700, Andres Freund wrote:
> > Also, I found one suspicious thing, in AGG_PLAIN_TRANS section we don't
> > switch the memory context back in the branch with ExecAggTransReparent. I
> > never found any consequences of that, but just in case I believe it makes sense
> > to do so.
> 
> I'll look at that next.

That's indeed necessary. Pushed. Thanks!

> 
> > And the last thing - where can I find a documentation about how to properly
> > apply patches for GDB & perf support to llvm? I remember they were posted here,
> > and found some of them here [1] from Andres, but apparently part of them was
> > already applied on top of llvm. Looks like for the gdb support I need to apply
> > 0006-ORC-JIT-event-listener-support (since there is a gdb listener mentioned
> > there), but with this patch I have an error:
> > 
> >     error: ‘ObjHandleT’ was not declared in this scope
> > 
> > So I'm confused how should it be?
> 
> I've merged the GDB part into LLVM, and am about to merge the perf part
> too. I plan to push a fix to PG adapting it to use the agreed upon /
> merged LLVM APIs. Then you'll just need a recent LLVM
> checkout. Unfortunately the relevant LLVM internal APIs have changed
> quite rapidly over the last few releases (and a lot within individual
> releases), so it's not easy to provide a patch for the individual versions.

Adapted the PG bits.

Greetings,

Andres Freund