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From "Uwe Schindler" <>
Subject RE: TrieRange
Date Sat, 07 Feb 2009 17:29:17 GMT
Hi Yonik,

> On Sat, Feb 7, 2009 at 6:04 AM, Uwe Schindler <> wrote:
> > The field names could be changed, sure, the small performance
> optimization
> > is in TrieRangeFilter: The splitting of the range is done in a way, to
> not
> > seek back and forward in the Term list, just in forward direction. This
> is
> > only possible if the helper field is ordered *after* the original one.
> This should not matter unless the terms are near each other.
> That won't be the case with two different fields in a sufficiently sized
> index.

This is only a minimal optimization, suitable for very large indexes. The
problem is: if you have many terms in highest precission (a lot of different
double values), seeking is more costly if you jump from higher to lower
precisions. But as I noted, there is no problem for the code, the names of
the fields do not matter. The only optimization is if the helper field comes
before or after the main one.


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