pq: copyin statement has already been closed

[jlev]

Trying to import a relatively large (~1.8m row, 1.72 GiB) jsonl file, I get 1 row imported and then this error:
pq: copyin statement has already been closed

Seems like it might be related to this change released in lib/pq 1.9
lib/pq@83c4f41
per lib/pq#452

I've upgraded my fork to use lib/pq 1.9.0, but am getting the same error. Anyone here have a working build with current dependencies?

[jlev]

I switched to using running the copy statements via a psycopg2 cursor directly, but this problem remains.