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From Thomas Michael Engelke <thomas.enge...@posteo.de>
Subject Re: Weird Problem (possible bug?) with german stemming and wildcard search
Date Wed, 15 Oct 2014 07:50:37 GMT
Thank you very much,

this information is worht it's weight in gold. So far, we've used the 
asterisk method because it seemed logical and straight-forward. We will 
slowly migrate to a version using EdgeNGramFilterFactory.

Thanks a bunch.

Am 07.10.2014 14:42 schrieb Alexandre Rafalovitch:

> On 7 October 2014 08:25, Thomas Michael Engelke
> <thomas.engelke@posteo.de> wrote:
> 
>> So the culprit is the asterisk at the end. As far as we can read from 
>> the docs, an asterisk is just 0 or more characters, which means that 
>> the literal word in front of the asterisk should match the query.
> 
> Not quite: http://wiki.apache.org/solr/MultitermQueryAnalysis [1]
> 
> It's actually quite complicated and even depends on exact version of
> Solr you are using. In fact, out of all the analyzers you showed
> above, I think only LowerCase will be present on the chain. Look for
> (multi) marker at: http://www.solr-start.com/info/analyzers/ [2] for 
> more
> details.
> 
> On a higher level, I would suggest getting away from *-based expansion
> and looking at EdgeNGrams instead. You can see an example of
> autocomplete at
> http://www.solr-start.com/javadoc/solr-lucene/index.html [3] and the
> matching configuration at:
> https://github.com/arafalov/Solr-Javadoc/blob/master/JavadocIndex/JavadocCollection/conf/schema.xml#L24

> [4]
> 
> Or a dedicated Suggester module, though information on that is a bit
> harder to find.
> 
> Regards,
> Alex.
> 
> Personal: http://www.outerthoughts.com/ [5] and @arafalov
> Solr resources and newsletter: http://www.solr-start.com/ [6] and 
> @solrstart
> Solr popularizers community: 
> https://www.linkedin.com/groups?gid=6713853 [7]


Links:
------
[1] http://wiki.apache.org/solr/MultitermQueryAnalysis
[2] http://www.solr-start.com/info/analyzers/
[3] http://www.solr-start.com/javadoc/solr-lucene/index.html
[4] 
https://github.com/arafalov/Solr-Javadoc/blob/master/JavadocIndex/JavadocCollection/conf/schema.xml#L24
[5] http://www.outerthoughts.com/
[6] http://www.solr-start.com/
[7] https://www.linkedin.com/groups?gid=6713853

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