LOAD FIXED
    FROM inline
    (
        "CHARS.LETTERS" from 0 for 3,
        "CHARS.NUMBERS" from 3 for 3
    )
    INTO postgresql:///pgloader?fixed
    (
        "CHARS.LETTERS",
        "CHARS.NUMBERS"
    )

    WITH truncate

    BEFORE LOAD DO
    $$ drop table if exists fixed; $$,
        $$ create table fixed (
            "CHARS.LETTERS" char(3),
            "CHARS.NUMBERS" char(3)
        );
    $$;

abc123
def456
ghi789