On Sun, 15 Dec 2002 23:49:57 -0300, Alvaro Herrera
<alvherre@dcc.uchile.cl> wrote:
>PageGetMaxOffsetNumber (the upper bound) returns a consistent value
>that's far too high (4294967291, 0xFFFFFFFB)
Alvaro, maybe this comment from bufpage.h can shed some light on it?
/** PageGetMaxOffsetNumber* Returns the maximum offset number used by the given page.* Since offset numbers are
1-based,this is also the number* of items on the page.** NOTE: to ensure sane behavior if the page is not
initialized* (pd_lower == 0), cast the unsigned values to int before dividing.* That way we get -1 or so, not a huge
positivenumber...*/
#define PageGetMaxOffsetNumber(page) \ (((int) (((PageHeader) (page))->pd_lower - SizeOfPageHeaderData)) \ / ((int)
sizeof(ItemIdData)))
0xFFFFFFFB is -5.
With SizeOfPageHeaderData == 20 and sizeof(ItemIdData) == 4 you get
this result for pd_lower == 0.
ServusManfred