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From Tri Cao <tm...@me.com>
Subject Re: How to handle words that stem to stop words
Date Mon, 07 Jul 2014 21:06:50 GMT
I think emitting two tokens for "vans" is the right (potentially only) way to do it. You could
also control the dictionary of terms that require this special treatment.

Any reason makes you not happy with this approach?

On Jul 06, 2014, at 11:48 AM, Arjen van der Meijden <acmmailing@tweakers.net> wrote:

Hello list,

We have a fairly large Lucene database for a 30+ million post forum. 
Users post and search for all kinds of things. To make sure users don't 
have to type exact matches, we combine a WordDelimiterFilter with a 
(Dutch) SnowballFilter.

Unfortunately users sometimes find examples of words that get stemmed to 
a word that's basically a stop word. Or reversely, where a very common 
word is stemmed so that it becomes the same as a rare word.

We do index stop words, so theoretically they could still find their 
result. But when a rare word is stemmed in such a way it yields a 
million hits, that makes it very unusable...

One example is the Dutch word 'van' which is the equivalent of 'of' in 
English. A user tried to search for the shoe brand 'vans', which gets 
stemmed to 'van' and obviously gives useless results.

I already noticed the 'KeywordRepeatFilter' to index/search both 'vans' 
and 'van' and the StemmerOverrideFilter to try and prevent these cases. 
Are there any other solutions for these kinds of problems?

Best regards,

Arjen van der Meijden

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