On Thu, 10 Mar 2005 10:24:46 +1000, David Brown <[EMAIL PROTECTED]>
>What concerns me is that this all depends on the correlation factor, and 
>I suspect that the planner is not giving enough weight to this. 

The planner does the right thing for correlations very close to 1 (and
-1) and for correlations near zero.  For correlations somewhere between
0 and 1 the cost is estimated by interpolation, but it tends too much
towards the bad end, IMHO.


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