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 <[EMAIL PROTECTED]> 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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