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.

Commencez par la documentation de PostgreSQL et d’asyncpg sur copy_from_query, puis examinez comment sa coroutine de sortie est décrite dans les ressources asyncpg disponibles. Documentez les circonstances, le cas échéant, dans lesquelles les sorties texte, CSV et binaire évitent les lignes partielles, et indiquez clairement la garantie offerte aux utilisateurs.