Re: Fix misaligned access of ItemPointerData on ARM

Piotr Stefaniak <postgres@piotr-stefaniak.me> writes:
> But due to how ExecRowMark struct is laid out in memory, the packed 
> struct ItemPointerData begins at an uneven offset, leading to misaligned 
> access whenever BlockIdData is set by ItemPointerSetInvalid() (and 
> likely in some other places, too).

But BlockIdData is laid out and accessed as two 16-bit fields, so there
should be no problem.  On what platform exactly do you see a failure?
        regards, tom lane