Dimitri,
> Seems to me that :
> - GreenPlum provides some commercial parallel query engine on top of
> PostgreSQL,
I certainly think so and so do our customers in production with 100s of
terabytes :-)
> - plproxy could be a solution to the given problem.
> https://developer.skype.com/SkypeGarage/DbProjects/PlProxy
This is solving real world problems at Skype of a different kind than
Greenplum, well worth checking out.
- Luke