On 2016-04-14 21:02:26 -0400, Tom Lane 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.
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