Re: BRIN indexes - TRAP: BadArgument

On Sat, Nov 8, 2014 at 8:56 AM, Alvaro Herrera <alvherre@2ndquadrant.com>
wrote:

>
> I just pushed this, after some more minor tweaks.  Thanks, and please do
> continue testing!
>
>
I'm having problems getting this to compile on MSVC. Attached is a patch
which fixes the problem.

There also seems to be a bit of a problem with:

brin.c(250): warning C4700: uninitialized local variable 'newsz' used

/*
 * Before releasing the lock, check if we can attempt a same-page
 * update.  Another process could insert a tuple concurrently in
 * the same page though, so downstream we must be prepared to cope
 * if this turns out to not be possible after all.
 */
samepage = brin_can_do_samepage_update(buf, origsz, newsz);

LockBuffer(buf, BUFFER_LOCK_UNLOCK);

newtup = brin_form_tuple(bdesc, heapBlk, dtup, &newsz);

Here newsz is passed to brin_can_do_samepage_update before being
initialised. I'm not quite sure of the solution here as I've not spent much
time looking at it, but perhaps brin_form_tuple needs to happen before
brin_can_do_samepage_update, then the lock should be released? I didn't
change this in the patch as I'm not sure if that's the proper fix or not.

The attached should fix the build problem that anole is having:
http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=anole&dt=2014-11-07%2022%3A04%3A03

Regards

David Rowley