Michael Paquier <michael.paqu...@gmail.com> writes:
> On Mon, Apr 18, 2016 at 12:31 PM, Peter Eisentraut <pete...@gmx.net> wrote:
>> I don't know if it's worth tracking this as an open item and thus
>> kind-of release blocker if no one else has the problem.  But I
>> definitely still have it.  My initial suspicion was that this had
>> something to do with a partial upgrade to gcc 6 (not yet released), in
>> other words a messed up system.  But I was able to reproduce it in a
>> freshly installed chroot.  It only happens with various versions of gcc,
>> but not with clang.  So I'm going to have to keep digging.

> gcc is moving slowly but surely to have 6.0 in a released state btw:
> https://gcc.gnu.org/ml/gcc/2016-04/msg00103.html

Given that it's apparently showing the results of asind as NULL, the
theory that comes to mind is some sort of optimization issue affecting
the output tuple's null-flags.  I have no idea why only this test would
be affected, though.  Anyway, a good way to test that theory would be
to see if the -O level affects it.

                        regards, tom lane

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