Ivan - have you considered using NumberUtils?
<http://lucene.zones.apache.org:8080/hudson/job/Lucene-Nightly/
javadoc/org/apache/lucene/document/NumberTools.html>
I'm curious if those utility methods solve the same problem you're
working on.
Erik
On Sep 13, 2007, at 1:19 PM, Ivan Vasilev wrote:
Hi All,
I have made some changes in my Lucene source, so that values of
numeric fields to be treated as numbers but not as Strings. After
testing everything seems to work correctly, but I still would like
to know your opinion about this.
So my approach is the following:
1. As during the indexing process the terms are ordered according
their values I made changes in the methods TermBuffer.compareTo
(TermBuffer other) and Term.compareTo(Term other) so that when the
filed contains numeric data comparison to be made based on numeric
logic (Integer.compareto(..), Float.compareTo(..)). So this orders
terms based on numeric logic but not based on lexicographical one.
2. To work correctly range searches similar changes were made in
RangeFilter.bits(IndexReader reader) and RangeQuery.rewrite
(IndexReader reader) methods.
Changes seem to be very simple, but I did not found case when they
lead to wrong behavior.
Before these changes to make range queries on numeric fields I made
values of those fields with fixed length so that the
lexicographical order to be the same like the numeric one. So I had
to keep dates in some fields and I made them 13 length fields that
keep UTC representation of the date. When the UTC was short I
prefixed it with zeroes. This made range searches to work correctly
for the time interval 1970 - 2280 approximately. Now with the new
implementation I do not have any restrictions about this time
interval.
So before some time I digged in Lucene forum and saw there were
some discussions about this. So if anybody uses also such approach,
or have bad experience with it, please tell me.
Tanks in advance.
Best Regards,
Ivan
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