Hi hackers (and specially Pavel Stehule),
 I could really use the grouping set feature for some complex queries I'm
 migrating from other db vendor. If my WEB searching is precise, this
 wiki page [1] and this thread[2] are the last updates on the subject. 
 I'm willing to test how these functions in my project but some questions first:
  1- is there an up-to-date version of the patch that I should be aware of?
  2- Can I apply that patch to 8.4.8?
  3- any extra recommendations?  


[1] http://wiki.postgresql.org/wiki/Grouping_Sets
[2] http://archives.postgresql.org/pgsql-hackers/2010-08/msg00647.php

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