On Fri, Apr 24, 2009 at 10:26:21PM +0300, Shai Erera wrote:
> I think we can make some optimization to DocIdSetIterator. Today, it defines
> next() and skipTo(int) which return a boolean. I've checked the code and it
> looks like almost always when these two are called, they are followed by a
> call to doc().
>
> I was thinking that if those two returned the doc Id they are at, instead of
> boolean, that will save the call to doc().
> What do you think?
It'll work.
Nathan Kurz proposed exactly this change for KinoSearch last July.
<http://rectangular.com/pipermail/kinosearch/2007-July/004149.html>
I think there is a small gain by having Scorer_Advance return a doc number
directly rather than a boolean, obviating the need for a follow-up call to
Scorer_Doc.
I finished the implementation last October.
One additional wrinkle, though: doc nums start at 1 rather than 0, so the
return values for Next() and Advance() can double as a booleans.
Marvin Humphrey
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