On Mon, Jun 18, 2018 at 5:57 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> > I'm not sure about the "enforce constraint only" argument --- that > sounds like a made-up use-case to me. It's pretty hard to imagine > a case where a unique index applies to a query and yet you don't want > to use it. > I've not seen it with unique constraints, but have with EXCLUDE constraints. GiST index costing is not very robust, and the planner can easily decide that a read query should use the EXCLUDE-supporting GiST index in cases where it is not optimal. Cheers, Jeff
