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.

Comienza con la documentación de PostgreSQL y asyncpg sobre copy_from_query y, a continuación, sigue cómo se describe su corrutina de salida en el material disponible de asyncpg. Documenta las circunstancias, si las hay, en las que la salida de texto, CSV y binaria evita filas parciales, y deja clara la garantía para los usuarios.