/*
* If at page start, we must skip over the page header. But
we can't
* do that until we've read in the page, since the header
size is
* variable.
*/
i don't know the meaning behind this comments,
if ((RecPtr->xrecoff % XLogSegSize) == 0)
it's a long page header, else a short page header,
so "the header size" can be calculated ? right?
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