It would be nice to get doctrine compatible with Amazon Redshift. It uses a Postgres connector but there are some differences. I'm currently facing an issue with the primary id, in Redshift the generation of an id is different from Postgres and so I'm getting errors associated with generating an id.
Here are some references that might be useful:
node-orm faced the same issue and seems like they figured it out: https://github.com/dresende/node-orm2/issues/39