eZ Find / Solr config for partial search on latin chars

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Author	Message
Bjørnar Grøtterud	Friday 13 May 2011 8:16:29 am Hi, We have an install with eZ find 2.3 configured with ReversedWildcardFilterFactory. It works good on partial wildcard searches, but we still have issues when searching for words that starts with an latin character, when the query is to, three or four characters long. An example: We have indexed an object named Ølbolle Query - result: øl - no result ølb - no result ølbo - no result ølbol - no result ølboll - ølbolle ølbolle - ølbolle When searchin for word starting with non-latin characters, this is not an issue. Our indez-analyser is set up as follows: <analyzer type="index"> <tokenizer class="solr.WhitespaceTokenizerFactory"/> <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" /> <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="1"/> <filter class="solr.LowerCaseFilterFactory"/> <filter class="ISOLatin1AccentFilterFactory"/> <filter class="solr.ReversedWildcardFilterFactory" withOriginal="true" maxPosAsterisk="3" maxPosQuestion="2" maxFractionAsterisk="0.33"/> </analyzer> Any experience / suggestions greatly appreciated.
Paul Borgermans	Monday 16 May 2011 11:58:44 am Hello Bjørnar I guess you mean that using normal wildcards (asterix) after the characters which are added in your template logic The culprit is actually the ISOLatin filter factory: when doing wildcard searches, the analysis steps are not done.There is still no stable resolution in Solr (where the "problem" actually is). The same for lowercasing by the way. If you really want to rely so much on wildcards (which I dont recommend either actually), best is to remove the ISOlatin "normalisation" as well (both index and query analysis steps) Furthermore, I think you did not remove the stemming step for the query part of your text field type in schema.xml (otherwise you should not get a match for ølboll). You should absolutely remove the stemming part there as well. It would be good that you email me your schema.xml for closer inspection Cheers Paul eZ Publish, eZ Find, Solr expert consulting and training http://twitter.com/paulborgermans
Bjørnar Grøtterud	Thursday 19 May 2011 12:42:11 am Hi Paul, thanks for your reply. The reason why we have added wildcards, is that we found this as the only solution for partial search for both first and last part of a word. It actually works well, exept for latin chars. Ill try your suggestion on removing the ISOLatin1AccentFilterFactory. We have already removed the SnowballPorterFilterFactory from the query part in our schema.xml. Ill send you our schema.xml, thanks for taking a look! Best regards Bjørnar

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Friday 13 May 2011 8:16:29 am

Hi,

We have an install with eZ find 2.3 configured with ReversedWildcardFilterFactory. It works good on partial wildcard searches, but we still have issues when searching for words that starts with an latin character, when the query is to, three or four characters long.

An example:

We have indexed an object named Ølbolle

Query - result:

øl - no result

ølb - no result

ølbo - no result

ølbol - no result

ølboll - ølbolle

ølbolle - ølbolle

When searchin for word starting with non-latin characters, this is not an issue.

Our indez-analyser is set up as follows:

<analyzer type="index">

<tokenizer class="solr.WhitespaceTokenizerFactory"/>


<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" />


<filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="1" catenateNumbers="1" catenateAll="0" splitOnCaseChange="1"/>


<filter class="solr.LowerCaseFilterFactory"/>
<filter class="ISOLatin1AccentFilterFactory"/>

<filter class="solr.ReversedWildcardFilterFactory" withOriginal="true" maxPosAsterisk="3" maxPosQuestion="2" maxFractionAsterisk="0.33"/>
</analyzer>

Any experience / suggestions greatly appreciated.

Paul Borgermans

Monday 16 May 2011 11:58:44 am

Hello Bjørnar

I guess you mean that using normal wildcards (asterix) after the characters which are added in your template logic

The culprit is actually the ISOLatin filter factory: when doing wildcard searches, the analysis steps are not done.There is still no stable resolution in Solr (where the "problem" actually is). The same for lowercasing by the way.

If you really want to rely so much on wildcards (which I dont recommend either actually), best is to remove the ISOlatin "normalisation" as well (both index and query analysis steps)

Furthermore, I think you did not remove the stemming step for the query part of your text field type in schema.xml (otherwise you should not get a match for ølboll). You should absolutely remove the stemming part there as well.

It would be good that you email me your schema.xml for closer inspection

Cheers

Paul

eZ Publish, eZ Find, Solr expert consulting and training
http://twitter.com/paulborgermans

Bjørnar Grøtterud

Thursday 19 May 2011 12:42:11 am

Hi Paul,

thanks for your reply.

The reason why we have added wildcards, is that we found this as the only solution for partial search for both first and last part of a word. It actually works well, exept for latin chars.

Ill try your suggestion on removing the ISOLatin1AccentFilterFactory.

We have already removed the SnowballPorterFilterFactory from the query part in our schema.xml.

Ill send you our schema.xml, thanks for taking a look!

Best regards

Bjørnar