On Tue, Jul 9, 2019 at 2:19 AM Tom Lane <t...@sss.pgh.pa.us> wrote: > Given the purposes of this test, I think it'd be reasonable to force > both enable_hashjoin = on and enable_mergejoin = off at the very top > of the join_hash script, or the corresponding place in join.sql in > v11. Thomas, was there a specific reason for forcing enable_mergejoin > = off for only some of these tests?
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. -- Thomas Munro https://enterprisedb.com
