load database
     -- from   mysql://root@localhost/pgloader
     from      mysql://root@unix:/tmp/mysql.sock:3306/pgloader
     into postgresql:///pgloader

 WITH concurrency = 2,
      multiple readers per thread,
      rows per range = 50000

 ALTER SCHEMA 'pgloader' RENAME TO 'mysql'

 CAST column utilisateurs__Yvelines2013-06-28.sexe
          to text drop not null using empty-string-to-null,

      column base64.id to uuid drop typemod,
      column base64.data to jsonb using base64-decode

 BEFORE LOAD DO $$ create schema if not exists mysql; $$;