I wrote:
> I can duplicate this in HEAD and v10, but not 9.6, so I've added it
> as an open issue for v10.  No idea what broke it.

Oh, scratch that: the issue exists in 9.6, it's just that the particular
test query you're using here does not generate a parallelized plan in
9.6, as shown by "explain".  With a different query that does get
parallelized, 9.6 fails too:

regression=#  select sum(ten) from tenk1;
ERROR:  role "testuser1" does not exist
CONTEXT:  parallel worker

Still, I think it's reasonable to characterize this as "must fix for v10".

                        regards, tom lane

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