Line number in error message is incorrect when loading a CSV-file with multi-line records.

Hello,

I am importing CSV files into a Postgres database with the COPY statement.
Some of the CSV files do have records that span over multiple lines.
These records are surrounded by double-quotes.

This imports fine when there are no errors.

However, when an error is thrown because of an unique constraint, the
line number in the error message is off.

I have attached an example CSV and SQL file.

When executing the attached SQL-file (change the location of the CSV),
the following error message appears:
ERROR: duplicate key value violates unique constraint "import_test_pkey"
DETAIL: Key (id)=(3) already exists.
CONTEXT: COPY import_test, line 13

However, the error in the CSV is located at line 23 (Or the 4th record)

Postgres version: "PostgreSQL 9.6.5 on x86_64-pc-linux-gnu, compiled by
gcc (Debian 4.7.2-5) 4.7.2, 64-bit"
OS: Linux Mint

Thanks,

Patrick van Coeverden