[xenophonf]

I definitely view "open core" products with greater skepticism than truly open source ones, but I think it comes down to the community surrounding (and engendered by) the sponsoring company/foundation. These Citus guys seem to be really enthusiastic about contributing their work to the community. That attitude mitigates any concerns I have, because to me it seems that they are really a part of the larger PostgreSQL community---not just trying to take advantage of it like certain companies whose names we won't mention.