Steve Randall <srandall(at)s3(dot)com> writes:
> running pg 9.6.1 on AWS
> max_parallel_workers_per_gather = 4
> This only occurs in some schemas, not all. The affected schemas have
> approx 1 million rows in the table. Much larger schemas (65 million rows)
> and smaller schemas(100K rows) do not have the problem.
FWIW, I failed to duplicate this from the information provided.
Can you get us EXPLAIN output for the troublesome case, or does it
fail before printing the EXPLAIN output? How about a stack trace
from the errfinish call?
regards, tom lane