David Steele <david@pgmasters.net> writes:
> I'm looking at this as more than a fix for 9.6. I can't see any reason
> for the backup control session to run queries in parallel and possibly
> use more resources, so parallelism is disabled for all versions that
> support it.
Post-9.6, these functions are correctly marked as parallel-restricted,
so there really shouldn't be an issue.
regards, tom lane