[GENERAL] PostgreSQL TPC-H test result?

[Amber]

I read something from 
http://monetdb.cwi.nl/projects/monetdb/SQL/Benchmark/TPCH/index.html saying 
that PostgreSQL can't give the correct result of the some TPC-H queries, I 
wonder is there any official statements about this, because it will affect our 
plane of using PostgreSQL as an alternative because it's usability. BTW I don't 
think PostgreSQL performances worse because the default configuration usually 
can't use enough resources of the computer, as as memory.