To create two csv-files:

```sh
echo -e "123\n456" > t0.txt
echo -e '"foo","bar"\n"foo\"bar\"","baz"' > t1.txt

```

Now, I want append the columns in `t1.txt` to `t0.txt`, so that the result becomes this:

```none
123,"foo","bar"
456,"foo\"bar\"","baz"

```

First try, using [csvtool](https://github.com/Chris00/ocaml-csv)

```sh
csvtool paste t0.txt t1.txt 
Fatal error: exception Csv.Failure(2, 1, "Bad '"' in quoted field")

```

So, `csvtool` doesn't seem to handle the escaped quotation mark in `"foo\"bar\""`.

My real world use case has two CSV-files with +150.000.000 rows and 11 columns so I need a tool which can do the task without having all the data simultaneously in RAM. 

Can csvtool be used with escaped quotation marks, or is there another tool that could solve this?

The final target for the CSV-file is a database in `mariadb`, so an efficient import to `mariadb` using `t0.txt` and `t1.txt` directly would be even better, but as far as I know `LOAD DATA INFILE` only works on a single CSV-file.

I definitely prefer a ready-made tool, but if there is none, then some C, Perl or Python snippets would be appreciated too.