This has just been fixed by Tom and will be in beta2.
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Tom Lane wrote:
> Gavin Sherry <swm@linuxworld.com.au> writes:
> > As for extending the length of xl_len, what happens if someone now has
> > 2^30 subtransaction IDs (as unlikely as that sounds)?
>
> They'll have run out of RAM to store the subxact-related storage before
> that (not to mention most likely have exhausted the CommandCounter
> range, not to mention exhausted their patience --- it takes a good while
> even to exercise the 2^16-subxact case). I'm satisfied if we can
> approach that limit. Exceeding it will be a task for some other release.
>
> regards, tom lane
>
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