Here is a very straw-man-level sketch of what I think might work. The option to COPY FROM looks something like
ERRORS TO other_table_name (item [, item [, ...]])
I tried to implement the patch using a table and came across a number of questions.
Which table should we implement for this feature: a system catalog table or store this table as a file or create a new table?
In these cases, security and user rights management issues arise.
It is better for other users not to see error lines from another user. It is also not clear how access rights to this table are inherited and be given.
