Numeric Range or comparision doesn't work

Hi,
it looks like Ferret still compares numeric fields by lexical ordering,
not numerical ordering. I am using Ferret 0.11.4(I tried in both linux
and windows, the results are the same).

index = Ferret::Index::Index.new()
docs = [
{:num => 1, :data => “yes”},
{:num => 1, :data => “no”},
{:num => 10, :data => “yes”},
{:num => 10, :data => “no”},
{:num => 100, :data => “yes”},
{:num => 100, :data => “no”},
{:num => 1000, :data => “yes”},
{:num => 1000, :data => “no”}
]

?> puts index.process_query(‘data:yes AND num:[10 100]’)
+data:yes +num:[10 100]
=> nil

puts index.search('d:data:yes AND num:[10 100]')

TopDocs: total_hits = 2, max_score = 1.777895 [
2 “”: 1.777895
4 “”: 1.777895
]
=> nil

puts index.process_query('data:yes AND num:[2 100]')

num:“data yes <> num 2 100”~4
=> nil

puts index.process_query('num:[2 100]')

num:“num 2 100”~2
=> nil

puts index.search('num:[2 100]')

TopDocs: total_hits = 0, max_score = 0.000000 [
]
=> nil

puts index.process_query('num:>2')

num:{2>
=> nil

puts index.search('num:>2')

TopDocs: total_hits = 0, max_score = 0.000000 [
]
=> nil

According to the release note for Ferret 0.10.6 at
http://rubyforge.org/forum/forum.php?forum_id=9058, “Range queries just
work. No need to pad numbers or format dates correctly.”

Is this a new bug?

Thanks.
Yaxm

To answer my own questions, the problem I had was that I didn’t pad
zeros in my query as the same way as in the IntegerAnalyzer.

rip from the “Ferret” ebook at

http://www.oreilly.com/catalog/9780596527853/index.html

module Ferret::Analysis

range comparision is done by lexical order, not numeric order

class IntegerTokenizer
def initialize(num, width)
@num = num.to_i
@width = width
end
def next
token = Token.new("%0#{@width}d" % @num, 0, @width) if @num
@num = nil
return token
end
def text=(text)
@num = text.to_i
end

end
  class IntegerAnalyzer
    def initialize(width)
      @width = width
    end
    def token_stream(field, input)
      return IntegerTokenizer.new(input, @width)
    end
  end

end

include Ferret::Analysis

analyzer = PerFieldAnalyzer.new(StandardAnalyzer.new)

“num” is the name of the field which to use this analyzer

analyzer[:num] = IntegerAnalyzer.new(3)

index = Ferret::Index::Index.new(:analyzer => analyzer)

docs = [
{:num => 5},
{:num => 15},
{:num => 30}
]

docs.each { |d| index << d }

puts index.search(‘num:[001 020]’)
TopDocs: total_hits = 2, max_score = 1.000000 [
0 “”: 1.000000
1 “”: 1.000000
]
=> nil

?> puts index.search(‘num:[010 100]’)
TopDocs: total_hits = 2, max_score = 1.000000 [
1 “”: 1.000000
2 “”: 1.000000
]

Yaxm Y. wrote:

Hi,
it looks like Ferret still compares numeric fields by lexical ordering,
not numerical ordering. I am using Ferret 0.11.4(I tried in both linux
and windows, the results are the same).

index = Ferret::Index::Index.new()
docs = [
{:num => 1, :data => “yes”},
{:num => 1, :data => “no”},
{:num => 10, :data => “yes”},
{:num => 10, :data => “no”},
{:num => 100, :data => “yes”},
{:num => 100, :data => “no”},
{:num => 1000, :data => “yes”},
{:num => 1000, :data => “no”}
]

?> puts index.process_query(‘data:yes AND num:[10 100]’)
+data:yes +num:[10 100]
=> nil

puts index.search('d:data:yes AND num:[10 100]')

TopDocs: total_hits = 2, max_score = 1.777895 [
2 “”: 1.777895
4 “”: 1.777895
]
=> nil

puts index.process_query('data:yes AND num:[2 100]')

num:“data yes <> num 2 100”~4
=> nil

puts index.process_query('num:[2 100]')

num:“num 2 100”~2
=> nil

puts index.search('num:[2 100]')

TopDocs: total_hits = 0, max_score = 0.000000 [
]
=> nil

puts index.process_query('num:>2')

num:{2>
=> nil

puts index.search('num:>2')

TopDocs: total_hits = 0, max_score = 0.000000 [
]
=> nil

According to the release note for Ferret 0.10.6 at
http://rubyforge.org/forum/forum.php?forum_id=9058, “Range queries just
work. No need to pad numbers or format dates correctly.”

Is this a new bug?

Thanks.
Yaxm

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