Re: fix crash with Python 3.11

On 16.01.22 23:53, Tom Lane wrote:
> I think a possible fix is:
>
> 1. Before entering the PG_TRY block, check for active subtransaction(s)
> and immediately throw a Python error if there is one. (This corresponds
> to the existing errors "cannot commit while a subtransaction is active"
> and "cannot roll back while a subtransaction is active". The point is
> to reduce the number of system states we have to worry about below.)
>
> 2. In the PG_CATCH block, after collecting the error data do
> AbortOutOfAnyTransaction();
> StartTransactionCommand();
> which gets us into a good state with no active subtransactions.
>
> I'm not sure that those two are the best choices of xact.c
> entry points, but there's precedent for that in autovacuum.c
> among other places.

AFAICT, AbortOutOfAnyTransaction() also aborts subtransactions, so why
do you suggest the separate handling of subtransactions?