Better performances are expected because of the removal of all MOD() operators
that would do a full scan to find the rows maching a given partition. Now a
query like '... where partition = x limit 10' should match only a subtree of
the table and not scan lots of rows if there is none matching this partition.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2306 71dcc9de-d417-0410-9af5-da40c76e7ee4