mysql_fdw trouble

Hello,

I have a MySQL/PHP app that I want to port to PostgreSQL so I just installed the mysql_fdw from https://github.com/EnterpriseDB/mysql_fdw because I'd like to do the data migration in SQL if possible.

Installation and set up worked flawlessly but when I run the following query
SELECT
  title,
  description,
  '[' || starts || ', ' || COALESCE(ends, 'infinity') || ']'
FROM
  _filler
WHERE
  starts IS NOT NULL
  AND description IS NOT NULL
  AND LENGTH(TRIM(title)) > 0
  AND LENGTH(TRIM(description)) > 0;