Searches with leading wildcards stopped working for me after moving to a multicore configuration of Solr, and at the same time removing all the dead entries in my schema.xml.
I was getting the following exception whenever I searched with a leading wildcard:
1 2 3 4 5 6 7 | Nov 4, 2011 12:14:44 AM org.apache.solr.common.SolrException log SEVERE: org.apache.solr.common.SolrException: org.apache.lucene.queryParser.ParseException: Cannot parse 'field1:*': '*' or '?' not allowed as first character in WildcardQuery at org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:105) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:173) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129) |
After diffing the configs, and schemas, I still couldn’t find anything that suggested why it didn’t work. Finally I found a forum post which said that to perform leading wildcard searches, you have to have a field type defined using the ”ReversedWildcardFilterFactory”. So I pasted the text_rev field from the default schema.xml:
<fieldType name="text_rev" class="solr.TextField" positionIncrementGap="100"> <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="0"/> <filter class="solr.LowerCaseFilterFactory"/> <filter class="solr.ReversedWildcardFilterFactory" withOriginal="true" maxPosAsterisk="3" maxPosQuestion="2" maxFractionAsterisk="0.33"/> </analyzer> <analyzer type="query"> <tokenizer class="solr.WhitespaceTokenizerFactory"/> <filter class="solr.SynonymFilterFactory" synonyms="synonyms.txt" ignoreCase="true" expand="true"/> <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" enablePositionIncrements="true" /> <filter class="solr.WordDelimiterFilterFactory" generateWordParts="1" generateNumberParts="1" catenateWords="0" catenateNumbers="0" catenateAll="0" splitOnCaseChange="0"/> <filter class="solr.LowerCaseFilterFactory"/> </analyzer> </fieldType> |
and restarted Solr, and it started to work.
And this is despite the fact that I’m not using the field type text_rev on any field.
