Robert Engels wrote:
I have always thought that the norms should be an interface, rather than
fixed, as there are many uses of lucene where norms are not necessary, and
the memory overhead is substantial.
I agree, but that's not the whole story.
If one seeks merely to avoid caching the norms in RAM, then all that is
required is a Scorer that does not access the norms. Thus an
implementation of the constant scoring query proposal (discussed in
another thread) would suffice to save memory at search time.
Long term, I would like Lucene to have an extensible index format. One
should be able to have different fields use different representations,
e.g., without norms, without positions, with a boost per position, with
alternate compression algorithms, etc. (This is item 11 on
http://wiki.apache.org/jakarta-lucene/Lucene2Whiteboard, which I doubt
will be a part of Lucene 2.0.)
Doug
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