Does COPY FROM gaurentee no partial rows?

A quick question, since this is not very obvious from the postgres or asyncpg docs: under what circumstances, if any, does copy_from_query guarantee that no partial rows will be delivered to the output coroutine?

In my experience this hasn't happened, and I could try some more exhaustive testing, but I imagine/hope that someone might just already know the answer.

To me the options seem to be:

• If the networking code reads one line at a time, then the 'text' format guarantees full rows, but not necessarily 'csv' or 'binary'
• Asyncpg itself or postgres itself may explicitly implement such a guarantee?
• Otherwise, there is no guarantee.

Inizia con la documentazione di PostgreSQL e asyncpg relativa a copy_from_query, quindi traccia il modo in cui la relativa coroutine di output è descritta nel materiale asyncpg disponibile. Documenta le circostanze, se presenti, in cui l’output testuale, CSV e binario evita righe parziali, e rendi chiara la garanzia per gli utenti.