[CI] Online c_per_u maintenance and query planner?

[Samuel Madden]

Yeah, that's fine.  If CT's are available, there's no harm in  
introducing predicates from them, I think.

On Jun 25, 2008, at 7:38 PM, Hideaki Kimura wrote:

> I'm now refactoring Section 4 (ESTIMATING CT COST)
>
> As Sam commented, there's some fluctuation in the paper about  
> whether the c_per_u statistics is maintained at runtime and used by  
> query planner for determining whether or not it rewrites query.
>
> I suggest a simpler approach; CT is always used once it was built,
> and c_per_u statistics is used only during designing. Assuming this,
> I'm going to cut the latter half of Section 4 by just saying "we used
> DS for estimating cardinality".
>
> Does it sound right?
> -- 
> Hideaki Kimura <hkimura at cs.brown.edu>
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