Export Postgresql for mongoimport

export.sql

COPY (
    SELECT 
        userid AS "userId.auto()",
	'some-static-string' AS "__classname__.auto()",
        failed_login_count AS "failedLoginCount.int32()",
        CASE WHEN mail_validated=TRUE THEN 'TRUE' ELSE 'FALSE' END AS "mailValidated.boolean()",
        -42 AS "answers.toTheQuestion.int32()",
        'Slate Star Codex' AS "answers.niceBlog.auto()"
    FROM 
        users.accounts
) TO '/tmp/users-accounts.csv' WITH (FORMAT CSV, HEADER TRUE, DELIMITER E'\t');