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From Erick Erickson <>
Subject Re: sort by field length
Date Tue, 25 May 2010 13:21:10 GMT
Ah, I may have misunderstood, I somehow got it in my mind
you were talking about the length of each term (as in string length).

But if you're looking at the field length as the count of terms, that's
another question, sorry for the confusion...

I have to ask, though, why you want to sort this way? The relevance
calculations already factor in both term frequency and field length. What's
the use-case for sorting by field length given the above?


On Tue, May 25, 2010 at 3:40 AM, Sascha Szott <> wrote:

> Hi Erick,
> Erick Erickson wrote:
>> Are you sure you want to recompute the length when sorting?
>> It's the classic time/space tradeoff, but I'd suggest that when
>> your index is big enough to make taking up some more space
>> a problem, it's far too big to spend the cycles calculating each
>> term length for sorting purposes considering you may be
>> sorting all the terms in your index worst-case.
> Good point, thank you for the clarification. I "thought" that Lucene
> internally stores the field length (e.g., in order to compute the relevance)
> and getting this information at query time requires only a simple lookup.
> -Sascha
>> But you could consider payloads for storing the length, although
>> that would still be redundant...
>> Best
>> Erick
>> On Mon, May 24, 2010 at 8:30 AM, Sascha Szott<>  wrote:
>>  Hi folks,
>>> is it possible to sort by field length without having to (redundantly)
>>> save
>>> the length information in a seperate index field? At first, I thought to
>>> accomplish this using a function query, but I couldn't find an
>>> appropriate
>>> one.
>>> Thanks in advance,
>>> Sascha

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