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From: Erik Hatcher <erik@ehatchersolutions.com>
Subject: Re: RE : ReSorting
Date: Tue, 25 May 2004 10:44:36 -0400
To: "Lucene Developers List" <lucene-dev@jakarta.apache.org>

On May 25, 2004, at 9:45 AM, Rasik Pandey wrote:
> Erik,
>
>> No, re-sorting without re-running a search is not possible (at
>> least
>> not easily).
>
> It would be nice to be able to provide different views of Hits based=20=

> on different sort criteria without touching the index for a second=20
> time as the "desired" results have already been returned. What do you=20=

> mean by "not easily"?

Actually, after thinking about it a bit more, it would be impossible to=20=

re-sort Hits after a search.  The new sorting infrastructure is=20
extremely efficient with resources, and does not keep more than it=20
needs to around.  So you could not change the field it is sorted on=20
without re-searching.

If all you were going to do is reverse a sort, you could walk the Hits=20=

backwards instead of re-sorting or re-searching.

I still say your best bet (and surely not slow?) is to re-search.

>> Why not just re-run a search with a different
>> sort?
>
> Of course that is one solution, but maybe not the most solid. As=20
> theoretically, an index at time A is not necessarily the same index at=20=

> time B. If the use case requires the most update data from the index=20=

> then your solution would suffice, but if a quasi snap-shot of a set of=20=

> results needed to be kept, it wouldn=92t solve the problem.

Again, this is not correct if you keep the IndexReader or IndexSearcher=20=

around.

	Erik


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