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From "Nadav Har'El" <>
Subject Re: draft 2.4 announcement
Date Sun, 05 Oct 2008 15:23:00 GMT
On Tue, Sep 30, 2008, Michael McCandless wrote about "Re: draft 2.4 announcement":
>   * All filters now return a DocIdSet instead of java.util.BitSet,
>     making filters more efficient and flexible.

Hi Michael, I was looking at how filtering works, and I noticed there is,
I believe, another very big change.

Previously, if I remember correctly, when a Filter was added to a query,
it worked on the HitCollector level, with each matching document being
checked against the filter. The new code is more efficient when the filter
only contains a small number of "on" documents, because now the scorer's
skipTo is actually used.

Isn't this a change worth mentioning, or am I just imagining things? (If I
am, sorry.. Interestingly, I found in CHANGES.txt a mention of LUCENE-1169
which is about fixing a bug in that new code, but I don't see any mention
of that new code being written).



Nadav Har'El                        |       Sunday, Oct  5 2008, 6 Tishri 5769
IBM Haifa Research Lab              |-----------------------------------------
                                    |Anyone who quotes me in their sig is an           |idiot. -- Rusty Russell's sig.

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