[Monetdb-developers] Single column select vs aggregation

Stefan de Konink stefan at konink.de
Thu Feb 18 19:54:28 CET 2010


Op 18-02-10 19:44, Stefan Manegold schreef:
> because it is built on an intermediate result (base BAT plus delta BATs
> applied) that is gone, again after the query has been executed.

I really feel I have learnt something now :) thanks :)

Given this information, is there a way to get the cost function to be 
optimised? Either by taking reuse in account, or otherwise by the 
modifying the size?

(Or more futuristic, storing the choice and the performance.)


Stefan





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