On Wed, Oct 11, 2017 at 11:51 AM, Simon Riggs <si...@2ndquadrant.com> wrote: > I'm inclined to believe Robert's hypothesis that there is some race > condition there. > > The question is whether that still constitutes a serializability > problem since we haven't done anything with the data, just passed it > upwards to be modified.
Well, the question is whether passing it upwards constitutes reading it. I kind of suspect it does. The plan tree isn't just blindly propagating values upward but stuff with them. There could be quite a bit between the ModifyTable node and the underlying scan if DELETE .. FROM or UPDATE .. USING is in use. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
