On 15 April 2016 at 13:02, Tom Lane <t...@sss.pgh.pa.us> wrote: > David Rowley <david.row...@2ndquadrant.com> writes: >> I proposed a fix over there, but it didn't go anywhere, probably >> because Tom and Andres discussed just disallowing unique indexes on >> system columns altogether. So, the attached patch does just that, and >> also fixes up the replica identity bugs too, as it's still possible >> that someone could create a unique index on a system column with an >> old version, upgrade, then try to set the replica identity to that >> index. We'd need to handle that correctly, so I fixed that too. > > AFAIR, what we were discussing was disallowing any index on a system > column (other than OID). I do not see why only unique indexes are > problematic for them; the semantic issues are independent of that.
I have to admit that my thoughts only considered ctid, which I imagined would have been OK to have an index on. As for the other system columns (apart from OID), I agree. -- David Rowley http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
