TRUNCATE {$NAMESPACE}_differential.differential_changeset_parse_cache;

ALTER TABLE {$NAMESPACE}_differential.differential_changeset_parse_cache
  CHANGE cache cache LONGBLOB NOT NULL;

Change LONGTEXT cache column to BINARY
Change LONGTEXT cache column to BINARY

See T4898. As it turns out, `latin1` LONGTEXT is not approximately equivalent
to LONGBLOB.
