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When an FK constraint is created, it needs the index on the referenced table to exist and be valid. When doing parallel pg_restore and the referenced table was partitioned, this condition can sometimes not be met, because pg_dump didn't emit sufficient object dependencies to ensure so; this means that parallel pg_restore would fail in certain conditions. Fix by having pg_dump make the FK constraint object dependent on the partition attachment objects for the constraint's referenced index. This has been broken since f56f8f8da6af, so backpatch to Postgres 12. Discussion: https://postgr.es/m/20191005224333.GA9738@alvherre.pgsql