Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net> writes:
> On Fri, Jan 08, 2016 at 10:45:27AM -0500, Tom Lane wrote:
>> Just for completeness, can you tell us which pg_trgm version (1.0
>> or 1.1) is installed in the 9.4 database?
> Sure:
> (pg_trgm,1.1,"text similarity measurement and index searching based on trigrams")
Hm. I just tried running a pg_upgrade here on a 9.4 database containing
pg_trgm 1.1, and didn't see any particular problem, so there's some
additional factor needed to cause your result. Hard to tell what.
Can you think of anything unusual about the history of your installation?
regards, tom lane