Re: SendRowDescriptionMessage() is slow for queries with a lot of columns

On 2017-10-11 08:54:10 -0700, Andres Freund wrote:
> On 2017-10-11 10:53:56 +0200, Alvaro Herrera wrote:
> > Maybe it'd be a good idea to push 0001 with some user of restrict ahead
> > of the rest, just to see how older msvc reacts.
>
> Can do. Not quite sure which older user yet, but I'm sure I can find
> something.

I looked around and didn't immedialy see a point where it'd be useful. I
don't really want to put it in some place where it's not useful. I think
we can just as well wait for the first patch using it to exercise
restrict support.

There's references to restrict support back to VS 2008:
https://msdn.microsoft.com/en-us/library/5ft82fed(v=vs.90).aspx

So I'll change the pg_config.h.win32 hunk to:
/* Define to the equivalent of the C99 'restrict' keyword, or to
nothing if this is not supported. Do not define if restrict is
supported directly. */
/* Visual Studio 2008 and upwards */
#if (_MSC_VER >= 1500)
/* works for C and C++ in msvc */
#define restrict __restrict
#else
#define restrict
#endif

there's several patterns like that (except for the version mapping) in
the file already.

- Andres