[KinoSearch] more abstract interfaces to kinosearch

[Hans Dieter Pearcey]

I keep forgetting that I'm not using all of kinosearch's functionality.  In
particular, I don't actually care about scoring, because I'm using KS like a
database and always sort by some inherent property of the documents.

On Thu, Jun 28, 2007 at 11:00:21PM -0700, Marvin Humphrey wrote:
> 
> On Jun 28, 2007, at 6:54 PM, Hans Dieter Pearcey wrote:
> 
> >I can't find any way to do the OR, there, in a Query, only with  
> >PolyFilter.
> 
> BooleanQuery?

I don't see how I'd do this just in terms of matching.  Maybe I don't
understand SHOULD?
 
> >"filters should be reused because they cache stuff, while queries  
> >can be
> >one-off because they don't",
> 
> In general, that's the case.
> 
> Filters are on-off, so their result can be cached in a BitVector.
> 
> Caching the result of a Scorer (derived from a Query) would be much  
> more expensive, because you'd need to keep 1 32-bit doc number and 1  
> float score around for each match.  In a worst case scenario -- every  
> doc matches -- we're talkin' 64 times as expensive as a Filter.

There's another question here that I may not have made explicit enough.  If
some particular selection mechanism is available both as a Query and as a
Filter -- e.g. BooleanQuery, which you can also use as part of a Queryfilter --
is there any reason to prefer one over the other, assuming that you are (as I
am) only interested in matching, not scoring?  Do Filters have any kind of
startup overhead compared to Queries, etc.?

> I think the ultimate solution will be to make MatchFieldQuery public  
> and give it a constant score which defaults to zero.   Then it could  
> be combined with a RangeFilter to produce the same effect as a  
> ConstantScoreRangeQuery.  MatchFieldQuery is relatively simple, and  
> lets you do things that require kludges otherwise.

I had found MatchFieldQuery, and thought that that might work, but didn't know
enough internals to be sure.  I like this idea.  What can I do to make it work?

hdp.