As part of an archiving routine that uses SqlAlchemy, I need to execute 
some pretty specific commands using `\copy` to archive a selection of 
columns, in a special order, into a csv.

Doing some digging, psycopg2 provides an interface to `COPY` -- but that 
doesn't work for my needs.  
I'd rather not use a subprocess to handle run `\copy` in psql, because then 
it's not in the transaction.

I'll be running this to partition 10GB of data into a lot of 10-50MB 
chunks... so I'd like to avoid piping this through sqlalchemy.  i'm not 
opposed to pulling this in row-by-row, but I'd really rather avoid it.  I 
have almost 250MM rows right now, and the future "nightly" build will be 
doing about 1MM at a time.

Does anyone have a suggestion for a workaround?

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