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From "Andy Liu" <andyliu1...@gmail.com>
Subject Re: Range search in numeric fields
Date Tue, 03 Apr 2007 17:59:50 GMT
You can try using MemoryCachedRangeFilter.

https://issues.apache.org/jira/browse/LUCENE-855

It stores field values in memory as longs so your values don't have to be
lexigraphically comparable.  Also, MemoryCachedRangeFilter can be orders of
magnitude faster than standard RangeFilter, depending on your data.

Andy

On 4/3/07, Ivan Vasilev <ivasilev@sirma.bg> wrote:
>
> Hi All,
> I have the following problem:
> I have to implement range search for fields that contain numbers. For
> example the field size that contains file size. The problem is that the
> numbers are not kept in strings with strikt length. There are field
> values like this: "32", "421", "1201". So when makeing search like this:
> +size:[10 TO 50], as the order for string is lexicorafical the result
> contains the documents with size 32 and 1201. I can see the following
> possible aproaches:
> 1. Changing indexing process so that all data entered in those fields is
> with fixed length. Example 0000032, 0000421, 0001201.
> Disadvantages here are:
>     - Have to be reindexed all existng indexes;
>     - The index will grow a bit.
>
> 2. Generating query without ranges but including all numbers between the
> bounds - +size=10 +size=11 +size=12........ +size=49 + size=50. For
> narrow ranges it makes sense but for large ones... :)
>
> 3. Generating query with intervals (inclusive and exclusive) but the
> number of this intervals will be the same (or one more) than the
> conditions in point 2. +size:[10 TO 50] -size:[10 TO 11999999999] -
> size:[11 TO 129999999999] ... etc.
>
> So if someone can help with some new oportunity please mail.
>
> Thanks in advance.
> Ivan
>
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