I wrote:
> So now I think this is a REDIRECT on either architecture, but the
> offset and length fields have different values, causing the redirect
> pointer to point to different places. Maybe it happens to point
> at a DEAD tuple in the big-endian case.
Just to make sure, I tried this test program:
#include <stdio.h>
#include <string.h>
typedef struct ItemIdData
{
unsigned lp_off:15, /* offset to tuple (from start of page) */
lp_flags:2, /* state of line pointer, see below */
lp_len:15; /* byte length of tuple */
} ItemIdData;
int main()
{
ItemIdData lp;
memset(&lp, 0x77, sizeof(lp));
printf("off = %x, flags = %x, len = %x\n",
lp.lp_off, lp.lp_flags, lp.lp_len);
return 0;
}
I get
off = 7777, flags = 2, len = 3bbb
on a little-endian machine, and
off = 3bbb, flags = 2, len = 7777
on big-endian. It'd be less symmetric if the bytes weren't
all the same ...
regards, tom lane
