Re: Information on savepoint requirement within transctions

"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Mon, Jan 29, 2018 at 8:33 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> What we do have though is client-side support for appropriate behaviors.
>> In psql, see the AUTOCOMMIT and ON_ERROR_ROLLBACK control variables.

> Not quite the same.  I think what people probably want is for psql to
> recognize it is in a transaction and before sending a command to the server
> for processing to precede it by sending "SAVEPOINT random()".  Then, before
> returning the result of the command to the user issue either "RELEASE
> SAVEPOINT" or "ROLLBACK TO SAVEPOINT" depending on whether the command
> succeeded or failed.  Then report the result to the user.

Which part of that isn't implemented by ON_ERROR_ROLLBACK?