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From Peter Karman <>
Subject [lucy-dev] RangeQuery and multi-value fields
Date Tue, 21 Jun 2011 05:42:43 GMT
Lucy does not (yet) support multi-value fields natively.

I want to override the behavior of the RangeQuery class to support my pseudo
multi-value fields, which I achieve by concatenating values with the \x03 byte.

I have fields containing values like:

doc 1:  "123\x{03}abc"
doc 2:  "def\x{03}456"

and I want to be able to do a range query like:

 lower => 'abc',
 upper => 'def'

and match both docs.

It looks like there are 2 possible approaches:

 * override the static methods in core/Lucy/Search/RangeQuery.c for
find_lower_bound() and find_upper_bound(), or

 * the core/Lucy/Index/SortCache.c Find() and Value() functions, so that they
can split the field values on the \x03 delimiter and treat each substring as a
separate value.

It seems like that second option is the better one since that should also affect
sorting, which would be a nice side effect. Maybe. :/

I'm wondering if (a) SortCache or RangeCompiler could/should be exposed as
public classes for overriding, and/or (b) if I'm just way off on this line of


Peter Karman  .  .

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