Re: PSA: --enable-coverage interferes with parallel query scheduling

2018-06-22 Thread Robert Haas
On Thu, Jun 21, 2018 at 4:00 PM, Tom Lane wrote: > We could probably fix it by using a significantly larger test case, > but that's not very attractive to put into the regression tests. > Anybody have a better idea about how to improve this? Or even a > clear explanation for what's causing it? (

PSA: --enable-coverage interferes with parallel query scheduling

2018-06-21 Thread Tom Lane
I've been poking at why coverage.postgresql.org shows that the second stanza in int8_avg_combine isn't exercised, when it clearly should be. I can reproduce the problem here, so it's fairly robust. Eventually it occurred to me to try a straight EXPLAIN ANALYZE VERBOSE, and what I find is that with