The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.5/static/sql-copy.html
Description:
The page that documents importing data from a CSV file ...
https://www.postgresql.org/docs/9.5/static/sql-copy.html
Does not speicy what, if any, are the limits on the line length, the number
of lines (records) or the overall file size.