> Am I understanding something incorrectly?
No, you've got it. You already covered the concerns there.
> That seems quite absurd, TBH. I know we've catered for some absurdity in
> the CSV code (much of it down to me), so maybe we need to be liberal in
> what we accept here too. IMNSHO, we should produce either a single JSON
> document (the ARRAY case) or a series of JSON documents, one per row
> (the LINES case).
For what it's worth, I agree with Andrew on this. I also agree with COPY FROM allowing for potentially bogus commas at the end of non-arrays for interop with other products, but to not do that in COPY TO (unless there is some real compelling case to do so). Emitting bogus JSON (non-array with commas) feels wrong and would be nice to not perpetuate that, if possible.
Thanks again for doing this. If I can be of any help, let me know. If\When this makes it into the production product, I'll be using this feature for sure.
-Davin