I tried to import several .csv Files (8GB, 56GB and 11GB) and all of them failed with unknown error.
CREATE TABLE name(
COMMIT_ID int,
PARENT_ID int
);
COPY FROM 'C:/Users/Public/name.csv' DELIMITER ',' NULL AS '\N' ESCAPE AS '\' CSV;
I tried over pgAdmin4 and cmd.
I use Windows 10 and PostgreSQL12
All other files that are from the same database and they are all <1GB. This files I can import without any issue
This might not answer the question directly but what I did is to downgrade my postgresql.
I use 9.6.18 now and just used the normal command
COPY FROM 'C:/Users/Public/name.csv' DELIMITER ',' NULL AS '\N' ESCAPE AS '\' CSV;
I know this is not the perfect solution. It just seems like it is an issue from postgresql and not an user issue