[rt-users] PostgreSQL full-text index default type: GiST or GIN

[ktm at rice.edu]

On Fri, Mar 18, 2016 at 12:21:13AM -0700, Alex Vandiver wrote:
> On Thu, 17 Mar 2016 17:47:50 -0500
> Matt Zagrabelny <mzagrabe at d.umn.edu> wrote:
> > > I am curious about the benchmarks you used to make this determination?
> > > In particular, the GIN fastscan option can dramatically improve search
> > > performance in versions 9.4 and above. Here is a nice discussion:
> > >
> > > http://blog.pgaddict.com/posts/performance-since-postgresql-7-4-to-9-4-fulltext
> > >
> > > In addition, GIN indexes are much smaller in PostgreSQL 9.4 and above.
> > > So I am curious about the data that motivated the change to GiST.
> 
> You are quite correct; GIN indexes are superior in virtually every
> way for our use case.  And the documentation is unfortunately in error;
> the default switched in the other direction, from GiST to GIN. See
> https://github.com/bestpractical/rt/commit/e103f6da for the actual
> behavior change.
> 
Hi Alex,

I am glad to find out it is only a documentation problem. I had not had a
chance to look at the actual code yet.

Regards,
Ken