On Tue, Jul 9, 2019 at 2:22 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Thomas Munro <thomas.munro@gmail.com> writes:
> > Based on a suggestion from Andres (if I recall correctly), I wrapped
> > each individual test in savepoint/rollback, and then set just the GUCs
> > needed to get the plan shape and execution code path I wanted to
> > exercise, and I guess I found that I only needed to disable merge
> > joins for some of them. The idea was that the individual tests could
> > be understood independently.
>
> But per this discussion, they can only be "understood independently"
> if you make some assumptions about the prevailing values of the
> planner GUCs.
Yeah. I had obviously never noticed that test script. +1 for just
enabling hash joins the top of join_hash.sql in 12+, and the
equivalent section in 11's join.sql (which is luckily at the end of
the file).
--
Thomas Munro
https://enterprisedb.com
