Tomas Vondra is now working on heavily-equipped multivariate statistics for OLAP usage. In contrast, this is a lightly implemented solution which calculates only the ratio between a rows estimated by current method and a actual row number. I think this doesn't conflict with his work except the grammar part.
I think it very obviously does conflict, so I don't see this patch as appropriate.
If you think a cut version of Tomas' patch is appropriate, then the usual response is to give a review that says "Tomas, I think a cut down version is appropriate here, can we reduce the scope of this patch for now?". If you have done that and he refuses to listen, then a separate patch version is appropriate. Otherwise we should just reject this second patchset to avoid confusion and to avoid encouraging people to take this approach.
--
Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services